12(x+y)^3(y-x)/【4(x+y)^2(x-y)】
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
5/12[-4/3(x-y)^3] *(x+y)^2 * (-x-y)^3 * 5/6(y-x)^2
(x-y)(x-2y)-(3x-2y)(x-3y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
(3x-y)²-2x(4x-5y)-(x+2y)²
(x-y/x+2y)³
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(x-4y)分之(3x)+(4y-x)分之(x+y)-(x-4y)分之(7y)
先化简,再求值:(x+2y)2-2(x-y)(x+y)+2y(x-3y),其中x=-2,y=12
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)