9(x-y)^2-12(x-y)+4 (x^2+y^2)^2-4x^2y^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
x^2-y^2/x+y-4x(x-y)+y^2/2x-y,
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知2x+y=4,求代数式[(x+y)2-(x-y)2-2y(x-12
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
5/12[-4/3(x-y)^3] *(x+y)^2 * (-x-y)^3 * 5/6(y-x)^2
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)