因式分解15a(x-y)²+5b(y-x)怎么写?
问题描述:
因式分解15a(x-y)²+5b(y-x)怎么写?
答
15a(x-y)²+5b(y-x)
=15a(x-y)²-5b(x-y)
=5(x-y)[3a(x-y)-b]
=5(x-y)(3ax-3ay-b)