y-x的2次方+2x-2y
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(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)
(x-y)的5次方-(y-x)的2次方,
(x-y)3次方.(x-y)2次方.(y-x)
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
x-y+x+y分之2y的2次方
y=x的-2次方(x
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(x的2次方-y的2次方-6x-6y)/(x+y)
(x—y)的2次方×(x—y)的5次方×(y-x)=()
(x-y)的3次方乘(x-y)的2次方乘(y-x)
(x-y)的2次方×(y-x)的3次方×(x-y)=
(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)
x的4次方+x的2次方y的2次方+y的4次方
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方