[-2(x-y)②]②·(y-x)③

问题描述:

[-2(x-y)②]②·(y-x)③
PS:②、③是二次方和三次方~

[-2(x-y)²]²×(y-x)³=4(x-y)④(y-x)③
=-4(x-y)⑦