(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
因式分解:x²(x-y)+(y-x)
已知(2x-y-1)^2+(-x+2y-3)^2=0,你能求出x+y的值吗?(要求写明做题步骤,)
{(x,y) |x|+|y|
x>y?x:y