因式分解：4a(x-y)2－2b（y-x）2 = = = = =
问题描述：
因式分解：4a(x-y)2－2b（y-x）2 = = = = =
答
4a(x-y)2－2b（y-x）2
=4a(x-y)2－2b(x-y）2
=2(x-y)2(2a-b）