已知5^=9,5^y=3,求5^x 2y+1和5^2x+y-2的值1、已知5^=9,5^y=3,求5^x 2y+1和5^2x+y 22、先化简,再求值：(a-3b)^2+(3a+b)^2-(a+5b)^2+(a-5b)^2,其中a=-8,b=-6已知5^x=9,5^y=3,求5^x 2y+1和5^2x+y-2的值

来源：学生作业帮助网编辑：作业帮时间：2024/05/06 02:09:58

已知5^=9,5^y=3,求5^x 2y+1和5^2x+y-2的值1、已知5^=9,5^y=3,求5^x 2y+1和5^2x+y 22、先化简,再求值：(a-3b)^2+(3a+b)^2-(a+5b)^2+(a-5b)^2,其中a=-8,b=-6已知5^x=9,5^y=3,求5^x 2y+1和5^2x+y-2的值
已知5^=9,5^y=3,求5^x 2y+1和5^2x+y-2的值
1、已知5^=9,5^y=3,求5^x 2y+1和5^2x+y 2
2、先化简,再求值：
(a-3b)^2+(3a+b)^2-(a+5b)^2+(a-5b)^2,其中a=-8,b=-6
已知5^x=9,5^y=3,求5^x 2y+1和5^2x+y-2的值

已知5^=9,5^y=3,求5^x 2y+1和5^2x+y-2的值1、已知5^=9,5^y=3,求5^x 2y+1和5^2x+y 22、先化简,再求值：(a-3b)^2+(3a+b)^2-(a+5b)^2+(a-5b)^2,其中a=-8,b=-6已知5^x=9,5^y=3,求5^x 2y+1和5^2x+y-2的值
2,a^2+9b^2-6ab+9a^2+b^2+6ab-a^2-25b^2-10ab+a^2+25b^2-10ab=10a^2+10b^2-20ab=10(a^2-2ab+b^2)=10(a-b)^2,第一个条件5^=9有问题,写成对数的形式就OK了

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知：4x = 5y,求(x+y) ：y 已知5|x+y-3|+(x-2y)²=5,求x+y的值已知2x-y=-3,求代数式5(x-3y)-2(x-7y) 已知3x-2y/x+y=5/3求x；y的值已知x+y/3x-2y=5/3求x；y的值已知x,y>0 2x+y+3=xy 求5x+4y最小值已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值已知5/x=3/y,求x+y/x+x-y/y-x^2-y^2/y^2的值已知x/5=y/3,求x+y分之x+x-y分之y减y^2/x^2-y^2的值已知(x-y):y=2:3,求(2x+5y)/(3x-2y)=? 已知2x-3y=5,4x^2-9y^2=55,求x,y 已知2x-3y=5,4x^2-9y^2=55,求x,y 已知5x-2y=9,4x+3y=6,求27x+3y的值初二数学已知(x-y):y=2:3,求(2x+5y):(3x-y)的值已知x-3y=0(y≠0)求2x+5y/3x-2y的值已知xy/x+y=2,求代数式3x-5y+3y/-x+3xy-y