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)²3(2a-3b)的2n-1次方-(3b-2a) 的2n-1次方(a-b)(n为正数)
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