(x-y)的2次幂乘x-y)的3次幂乘(y-x)的2次幂乘(y-x)的3次幂等于

（x-y）的3次幂乘（x-y)的2次幂乘（y-x)等于? 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 (x+3y)的平方+2(x-y)(x+y)+(x-3y)的平方 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方 [(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (x-y)的2次幂乘x-y)的3次幂乘(y-x)的2次幂乘(y-x)的3次幂 (x-y)的2次幂乘x-y)的3次幂乘(y-x)的2次幂乘(y-x)的3次幂等于 y=3(x-y),x=2(x-y)求x,y的值 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 (x-y)X(2x-2y)的平方X(3x-3y)的平方 (y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x) ((x+y)/(x+y))的平方乘(2y-2x)/(3x+3y)-(x的平方)/(x的平方-y的平方)除以x/y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 (x+y)的平方+(x+y)(x-3y) [(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)请帮我一下写两道计算题[(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)[（3x+2y）（3x-2y）-（x+2y）（5x-2y）]除以（4x） {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y