1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
(3x-2y)×(3x+2y)×(9x+4y)
(x+3y-4)(2x-y)
9y=3x-(x-1),4(x+y)-(2x+4)=8y
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
(3x-y)²-2x(4x-5y)-(x+2y)²
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
(3x+2y)(3x+4y)+9y平方