[(x-y)^7]÷(y-x)³-[4(x-y)²]²

问题描述:

[(x-y)^7]÷(y-x)³-[4(x-y)²]²

[(x-y)^7]÷(y-x)³-[4(x-y)²]²
=[(x-y)^7]÷[-(x-y)³-16(x-y)^4
=-(x-y)^4-16(x-y)^4
=-17(x-y)^4