2x+a(x-y)-2y (y-x)²-2x+2y （b+c）x+(c+a)x+(a+b)X
问题描述：
2x+a(x-y)-2y (y-x)²-2x+2y （b+c）x+(c+a)x+(a+b)X
(m-n)(p-q)(p-2q)-(n-m)(p+q)(p+2q)
(b-a)²+2a(b-a)-(a-b)
0.5xy-0.5y²-（x-y）²
3(2a-3b)的2n-1次方-(3b-2a) 的2n-1次方(a-b)（n为正数）
答
2x+a(x-y)-2y =2x-2y +a(x-y)=2(x-y) +a(x-y)=(2+a)(x-y)(y-x)²-2x+2y =(x-y)²-2(x-y)=(x-y)(x-y-2)（b+c）x+(c+a)x+(a+b)X=(b+c+c+a+a+b)X=2(a+b+c)x(m-n)(p-q)(p-2q)-(n-m)(p+q)(p+2q)=(m-n)(p-q)(p-2q)...