16-8(x-y)+(x-y)^2化简
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
化简:(2x-y)²-4(x-y)(x+y)
化简(-y-2/x)÷(x+2/y)的结果 【备用选项 A.-y/x B.-x/y C.x/y D.y/x 】 好了再加
(x+y)^2-16(x-y)^2
(x-y/x+2y)³
化简:(x+y)+(2x+11×2y
化简:2(3x-y)-3(x+7y)
-(5x+y)-3(2x-3y)(化简)