1.5平方线加绝缘皮多粗

1.已知在三角形ABC中,a^4+b^4+c^4=2c^2（a^2+b^2）求角C的大小2.若正数a b 满足 ab=a+b+3求a+b取值范围 ab取值范围 6题 北京市高中数学（高一下）教学内容我在人大附读高一,请问有谁知道高一下学期数学的教学内容啊? 已知lg2=a,lg3=b,求下列各式的值：(括号数字为底数)1,lg6 2,log(3)4 3,log(2)12 4,lg2\3 如果a＞b,则①a+b（ ）b+c ②a-b（ ）b-c ③ac（ ）bc（c>0）④c分之a（ ）c分之b (c 已知三个数A,B,C,且a的2次方bc>0,b的2次方ac 要让ac>bc,则a与b的大小取决于c的符号, 如果b分之ac＞0,bc＜0,且a（b-c）＞0,试确定a,b,c的符号. 1/2+1/3+...+1/n怎么做? 1^2+2^2+3^2+.+n^2 等于多少 1/N(N+I)+1/(N+1)(N+2)+1/(N+2)(N+3)+.+1/(N+9)(N+10)如何做? 1+2+3+4+. 如果点B在线段AC上,那么下列表达式中:那么下列表达式中:AC=BC;AB=2分之1AC;AC=2AB；AB+BC=AC,能表示B点是线段AC的中点的有（ ）个 如果点c在线段ab上下列表达式∶①ac＝1/2ab ②ab＝2bc ③ac＝bc ④ac+bc＝ab中,能表示c是线段ab中点的有如果点c在线段ab上,下列表达式∶①ac＝1/2ab ②ab＝2bc ③ac＝bc ④ac+bc＝ab中,能表示c是线段 如果点c在线段ab上下列1表达式∶①ac＝1／2ab②ab＝2bc③ac＝bc④ac+bc＝ab中,能表示c是线段ab中的有 个 1.Are you busy with your homework?改为同义句 Are you busy () () homework?1.Are you busy with your homework?（改为同义句）Are you busy () () homework?2.His mom is busy to water the flowers.（改错）3.绿色是我最喜欢的颜色.Green 如果点c在直线AB上,下列表达式如果点c在线段ab上下列1表达式∶①ac＝1／2ab②ab＝2bc③ac＝bc④ac+bc＝abjjj如果点c在直线ab上下列1表达式∶①ac＝1／2ab②ab＝2bc③ac＝bc④ac+bc＝ab中,能表示c是线段 如果点B在线段AC上,那么下列各表达式中AB=1/2AC,AB=BC,AC=2AB,AB+BC=AC能表示B是线段AC的中点的有（）A1个 B2个 C3个 D4个 10.–Are you through with your homework?.10.–Are you through with your homework?--Well,____ A.sort of B.go ahead C why not D that’s OK Are you busy______your work now?A.\ B.with C.in D.about 求理由 f(x)=x(x-1)(x-2).(x-999),求f\'(0)=_____ 已知：f(x)=1/{(x+1)^(1/3)+[(x+1)(x-1)]^(1/3)+(x-1)^(1/3)} 求f(1)+f(2)+...+f(2k-1)+...+f(999) 哪位知道还请给出解答,给出提示也可 f(x)=x/x+1,f(1/1000)+f(1/999)+.f(1/2)+f(1)+f(2).f(1000)=? 1\1*3+1\2*4+1\3*5+...+1\n(n+2) What are you busy ___these days?A,doing B,in doing 英语单项选择一题 What are busy __________ these days?What are busy __________ these days?A.do B.with C.doing D.to do I havent seen you for sevenraI days,What are y0u busy with?Yesterday I_______hiking with my friends、Now I________some 丨etters、Tomorrow I______.为什么 what are you busy about these days?(这句话有语法错误么?) 解方程mx2+(m-3)x-3 去减掉一笔是什么字, What are you busy with 在什么情况下用?3QWhat are you busy with 是在过去时才用的吗?一般问别人现在在做什么可不可以用这个呢? what a shame were u busy with work