4(x+y)2-20(x+y)+25.
4(x+y)^2-20(x-y)+25
4(x+y)²-20(x+y)+25
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x-2y)²+(2x-4y)(x+y)+(x+y)²
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
4(x+y)2-20(x+y)+25.
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
先化简,再求值:(x+y)(2x-y)-(x+2y)(x-2y),其中x=3,y=4.
4(x+y)-20(x+y)+25
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(x-y/x+2y)³