-4(x+2y)2+9(2x-y)2.
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
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
(x-y/x+2y)³
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
(3x-2y)×(3x+2y)×(9x+4y)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)