作业帮14道初一数学题40.(1-3m)/2-(2m+5)/3+(3+2m)/441.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^243.解不等式：x(x-3)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 04:56:13
14道初一数学题40.(1-3m)/2-(2m+5)/3+(3+2m)/441.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^243.解不等式：x(x-3)
14道初一数学题
40.(1-3m)/2-(2m+5)/3+(3+2m)/4
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
43.解不等式：x(x-3)
14道初一数学题40.(1-3m)/2-(2m+5)/3+(3+2m)/441.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^243.解不等式：x(x-3)
40.(1-3m)/2-(2m+5)/3+(3+2m)/4 =1/2-3m/2-2m/3-5/3+3/4+2m/4==-5/12-5m/3
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43.解不等式：x(x-3)1/3
44.3(2x-1)(x-3)-2(3x-2(2x-3) = -6x^2+5x-3
45.2008^2-2007*2009=2008^2-(2008-1)*(2008+1)=2008^2-(2008^2-1)=1
46.2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47.(x+y)^2(x-y)^2 =((x+y)(x-y))^2 =(x^2-y^2)^2 =x^4-2x^2y^2+y^4
48.(a-2b+3c)^2 =a^2+4b^2+9c^2-4ab+6ac-12bc
49.(3a-b)^2-(3a+b)^2 =(3a-b+3a+b)*(3a-b-3a-b) =-12ab
50.a(a-1)-(a^2-b)=8,求(a^2+b^2)/2-ab的值 32
51.(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52.(x+2)(x+3)(x-2)(x-3) =(x^2-4)(x^2-9) =x^4-13x^2+36
53.(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54.101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
=99980001
看不懂
自己做吧
我说#是乘号,其它就不知道了,自己做吧!
自己的作业最好自己做``考试的时候没人能帮你~数学全靠练习做的多才能考出好成绩~
自己的作业最好自己做``考试的时候没人能帮你~数学全靠练习做的多才能考出好成绩~
我说#是乘号,其它就不知道了,自己做吧!
不会就去问问老师吧!!!
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2...
全部展开
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42
(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43
x(x-3)<3x(x+2)-2x^2-3
~2x^2+x^2-3x-3x^2-6x+3<0
~-9x+3<0
~x>1/3
44你题目抄漏了-_-
3(2x-1)(x-3)-2(3x-2)(2x-3)
=6x^2-21x+9-12x^2+26x-12
=-6x^2+5x-3
45
2008^2-2007*2009
=2008^2-(2008-1)*(2008+1)
=2008^2-(2008^2-1)=1
46
2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47
(x+y)^2(x-y)^2
=((x+y)(x-y))^2
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
48
(a-2b+3c)^2
=a^2+4b^2+9c^2-4ab+6ac-12bc
49
(3a-b)^2-(3a+b)^2
=(3a-b+3a+b)*(3a-b-3a-b)
=-12ab
50
a(a-1)-(a^2-b)=8
~a^2-a-a^2+b=8
~b-a=8
(a^2+b^2)/2-ab
=(b-a)^2/2
=8^2/2=32
51你是不是哪里抄错了，答案怪异的很
(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52
(x+2)(x+3)(x-2)(x-3)
=(x^2-4)(x^2-9)
=x^4-13x^2+36
53
(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54
101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
=99980001
收起
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12a...
全部展开
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001、
做的我累死，完成了
对了你这有15道题
收起
额
看不懂啊
叫别人帮你做，自己永远都不会
40.(1-3m)/2-(2m+5)/3+(3+2m)/4 =1/2-3m/2-2m/3-5/3+3/4+2m/4==-5/12-5m/3
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42.(0.2...
全部展开
40.(1-3m)/2-(2m+5)/3+(3+2m)/4 =1/2-3m/2-2m/3-5/3+3/4+2m/4==-5/12-5m/3
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43.解不等式：x(x-3)<3x(x+2)-2x^2-3 x>1/3
44.3(2x-1)(x-3)-2(3x-2(2x-3) = -6x^2+5x-3
45.2008^2-2007*2009=2008^2-(2008-1)*(2008+1)=2008^2-(2008^2-1)=1
46.2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47.(x+y)^2(x-y)^2 =((x+y)(x-y))^2 =(x^2-y^2)^2 =x^4-2x^2y^2+y^4
48.(a-2b+3c)^2 =a^2+4b^2+9c^2-4ab+6ac-12bc
49.(3a-b)^2-(3a+b)^2 =(3a-b+3a+b)*(3a-b-3a-b) =-12ab
50.a(a-1)-(a^2-b)=8,求(a^2+b^2)/2-ab的值 32
51.(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52.(x+2)(x+3)(x-2)(x-3) =(x^2-4)(x^2-9) =x^4-13x^2+36
53.(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54.101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
=99980001
收起
QQ：152691464，本人是初三数学教师。平时学生所遇到的数学几何代数问题都可以来找我。我会在QQ上给你们最详细的解答和教你方法。如能给点鼓励的话必将全力教会你各种效果，做您的网上家教
这些题你该自己去做的,你现在可以在网上这么搜索可是考试的时候是不允许的,所以你还是自己做吧.
ppp
我很喜欢数学的，答案是下面的：
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c...
全部展开
我很喜欢数学的，答案是下面的：
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001
收起
自己的作业最好自己做
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
全部展开
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001
收起
1．____________________叫可见光，红外线、紫外线属于_______光。
2．太阳的热主要以________形式传送到地球上。
3．红外线能使被照射的物体发热,具有_______效应。物体辐射红外线的本领跟_______有关，_______越高，辐射的红外线越强。
4．紫外线是德国物理学家_________发现的，它的最显著的特性是_________...
全部展开
1．____________________叫可见光，红外线、紫外线属于_______光。
2．太阳的热主要以________形式传送到地球上。
3．红外线能使被照射的物体发热,具有_______效应。物体辐射红外线的本领跟_______有关，_______越高，辐射的红外线越强。
4．紫外线是德国物理学家_________发现的，它的最显著的特性是___________，根据这一原理可制成_________。
5．在“探测红外光外侧的热效应”中小明惊奇地发现：放在光带红光外侧的温度计，温度也会上升。根据这一现象，你能提出什么问题？
参考答案：
1．人眼能感觉到特定频率范围内的光；不可见光
2．红外线
3．热；温度；温度
4．里特；能使荧光物质发光；验钞机
5．温度计的示数为什么会上升？热从何处来？
收起
上面的,第二题答案错了!
这些题都挺简单的!为什么不自己做啊?
哎网络被你门这些懒虫用上了,不要在这耍小聪要自己做?
百川东到海,何时复西归.
少壮不努力,老大徒伤悲.
自己的作业最好自己做``考试的时候没人能帮你~数学全靠练习做的多才能考出好成绩~
这小毛孩子
合并同类项这么简单你都不做你怎么考高中阿!!!
晕，这么简单的题也在网上问，还一掷200分。如果你连这都不会，那恐怕你连高中都考不上。如果你会的话，你打字的时间就可以把这些题做完，干嘛还问。你自己好自为之吧。
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^...
全部展开
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42
(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43
x(x-3)<3x(x+2)-2x^2-3
~2x^2+x^2-3x-3x^2-6x+3<0
~-9x+3<0
~x>1/3
44你题目抄漏了-_-
3(2x-1)(x-3)-2(3x-2)(2x-3)
=6x^2-21x+9-12x^2+26x-12
=-6x^2+5x-3
45
2008^2-2007*2009
=2008^2-(2008-1)*(2008+1)
=2008^2-(2008^2-1)=1
46
2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47
(x+y)^2(x-y)^2
=((x+y)(x-y))^2
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
48
(a-2b+3c)^2
=a^2+4b^2+9c^2-4ab+6ac-12bc
49
(3a-b)^2-(3a+b)^2
=(3a-b+3a+b)*(3a-b-3a-b)
=-12ab
50
a(a-1)-(a^2-b)=8
~a^2-a-a^2+b=8
~b-a=8
(a^2+b^2)/2-ab
=(b-a)^2/2
=8^2/2=32
51你是不是哪里抄错了，答案怪异的很
(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52
(x+2)(x+3)(x-2)(x-3)
=(x^2-4)(x^2-9)
=x^4-13x^2+36
53
(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54
101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
=99980001
以后要自己做哦，不能全靠电脑的哟！＾＿＾
收起
14道初一数学题???
14和15不分!
悲哀!!
真悲哀!!!
非常悲哀!!!!
作业自己完成,
学习加倍努力.
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^...
全部展开
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
48
(a-2b+3c)^2
=a^2+4b^2+9c^2-4ab+6ac-12bc
49
(3a-b)^2-(3a+b)^2
=(3a-b+3a+b)*(3a-b-3a-b)
=-12ab
50
a(a-1)-(a^2-b)=8
~a^2-a-a^2+b=8
~b-a=8
(a^2+b^2)/2-ab
=(b-a)^2/2
=8^2/2=32
42
(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001
收起
这是初一的题！~~~？
有小学的吗可能我会
额..........看不懂耶！自己的作业最好是自己做！
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
全部展开
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
收起
麻烦
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
全部展开
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001、
40.(1-3m)/2-(2m+5)/3+(3+2m)/4 =1/2-3m/2-2m/3-5/3+3/4+2m/4==-5/12-5m/3
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43.解不等式：x(x-3)<3x(x+2)-2x^2-3 x>1/3
44.3(2x-1)(x-3)-2(3x-2(2x-3) = -6x^2+5x-3
45.2008^2-2007*2009=2008^2-(2008-1)*(2008+1)=2008^2-(2008^2-1)=1
46.2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47.(x+y)^2(x-y)^2 =((x+y)(x-y))^2 =(x^2-y^2)^2 =x^4-2x^2y^2+y^4
48.(a-2b+3c)^2 =a^2+4b^2+9c^2-4ab+6ac-12bc
49.(3a-b)^2-(3a+b)^2 =(3a-b+3a+b)*(3a-b-3a-b) =-12ab
50.a(a-1)-(a^2-b)=8,求(a^2+b^2)/2-ab的值 32
51.(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52.(x+2)(x+3)(x-2)(x-3) =(x^2-4)(x^2-9) =x^4-13x^2+36
53.(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54.101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
=99980001
收起
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^...
全部展开
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
48
(a-2b+3c)^2
=a^2+4b^2+9c^2-4ab+6ac-12bc
49
(3a-b)^2-(3a+b)^2
=(3a-b+3a+b)*(3a-b-3a-b)
=-12ab
50
a(a-1)-(a^2-b)=8
~a^2-a-a^2+b=8
~b-a=8
(a^2+b^2)/2-ab
=(b-a)^2/2
=8^2/2=32
42
(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001
还是自己做为好啊- -
收起
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^...
全部展开
40
(1-3m)/2-(2m+5)/3+(3+2m)/4
=1/2-5/3+3/4+(-3/2-2/3+2/4)m
=-5/12-5m/3
41
2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42
(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43
x(x-3)<3x(x+2)-2x^2-3
~2x^2+x^2-3x-3x^2-6x+3<0
~-9x+3<0
~x>1/3
44你题目抄漏了-_-
3(2x-1)(x-3)-2(3x-2)(2x-3)
=6x^2-21x+9-12x^2+26x-12
=-6x^2+5x-3
45
2008^2-2007*2009
=2008^2-(2008-1)*(2008+1)
=2008^2-(2008^2-1)=1
46
2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47
(x+y)^2(x-y)^2
=((x+y)(x-y))^2
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4
48
(a-2b+3c)^2
=a^2+4b^2+9c^2-4ab+6ac-12bc
49
(3a-b)^2-(3a+b)^2
=(3a-b+3a+b)*(3a-b-3a-b)
=-12ab
50
a(a-1)-(a^2-b)=8
~a^2-a-a^2+b=8
~b-a=8
(a^2+b^2)/2-ab
=(b-a)^2/2
=8^2/2=32
51你是不是哪里抄错了，答案怪异的很
(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52
(x+2)(x+3)(x-2)(x-3)
=(x^2-4)(x^2-9)
=x^4-13x^2+36
收起
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
全部展开
40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001、
做的我累死，完成了
40.(1-3m)/2-(2m+5)/3+(3+2m)/4 =1/2-3m/2-2m/3-5/3+3/4+2m/4==-5/12-5m/3
41.2/3(x-y)^(2n+1)*9/4(x-y)^(2n+1)*7/15(x-y)^4n
=2/3*9/4*7/15*(x-y)^(2n+1+2n+1+4n)
=7/10(x-y)^(8n+2)
42.(0.25a^3b^2)^2*(4a^2b)^3-3(-a^2b)^5*a^2b^2
=0.25^2a^6b^4*4^3a^6b^3+3a^10b^5*a^2b^2
=4a^12b^7+3a^12b^7
=7a^12b^7
43.解不等式：x(x-3)<3x(x+2)-2x^2-3 x>1/3
44.3(2x-1)(x-3)-2(3x-2(2x-3) = -6x^2+5x-3
45.2008^2-2007*2009=2008^2-(2008-1)*(2008+1)=2008^2-(2008^2-1)=1
46.2(2x-7y)(7y+2x)+x^2-(-4x+5y)(-5y-4x)
=2(4x^2-49y^2)+x^2+(25y^2-16x^2)
=-7x^2-73y^2
47.(x+y)^2(x-y)^2 =((x+y)(x-y))^2 =(x^2-y^2)^2 =x^4-2x^2y^2+y^4
48.(a-2b+3c)^2 =a^2+4b^2+9c^2-4ab+6ac-12bc
49.(3a-b)^2-(3a+b)^2 =(3a-b+3a+b)*(3a-b-3a-b) =-12ab
50.a(a-1)-(a^2-b)=8,求(a^2+b^2)/2-ab的值 32
51.(-2x-1)^2*(2x-2)^2-16(x+3)^2*(x-3)^2
=(-4x^2+2x+2)^2-16(x^2-9)^2
=16x^4+4x^2+4-16x^3-16x^2+8x-16(x^4-18x^2+81)
=-16x^3+276x^2+8x-1292
52.(x+2)(x+3)(x-2)(x-3) =(x^2-4)(x^2-9) =x^4-13x^2+36
53.(a+3)(a-3)(a^2+9)-(a^2-9)^2
=(a^2-9)(a^2+9)-(a^2-9)^2
=(a^2-9)(2a^2)
=2a^4-18a^2
54.101*99*9999
=(100+1)*(100-1)*9999
=9999*9999
=(10000-1)(10000-1)
=100000000-20000+1
收起
傻呀！！！合并同类项都不会！成绩不行哟！
自己的作业最好自己做``考试的时候没人能帮你~数学全靠练习做的多才能考出40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
全部展开
自己的作业最好自己做``考试的时候没人能帮你~数学全靠练习做的多才能考出40. -5/12-5/3m.
41. 7/10(x-y)^(6n+2)
42. 4a^72b^7+a^64b^7
43. x>1/3
44. -6x^2+5x-3
45. 1
46. -7x^2-73y^2
47. x^4-2x^2y^2+y^4
48. a^2+4b^2+9c^2-4ab+6ac-12bc
49. -12ab
50. 32
51. -16x^3+276x^2+8x-1292
52. x^4-13x^2+36
53. 18a^4-324a^2+1458
54. 10^8-2*10^4+1=99980001好成绩~
收起
哇，真可怕啊，这么多
自己的作业最好自己做``
我也是初一哒挖....
咋木见过这些字母......0 0 郁闷`.`.`