因式分解:-8a2-4a2b+2ab 8a(x-y)2-4b(y-x)

因式分解:-8a2-4a2b+2ab 8a(x-y)2-4b(y-x)

-8a²-4a²b+2ab=-2a(4a+2ab+b)
8a(x-y)²-4b(y-x)=8a(x-y)²+4b(x-y)=(x-y)(8ax-8ay+4b)