问题描述: 因式分解:(1)49(x+y)²-9(x-y)² (2)(x²-5)²+8(x²-5)+16 1个回答 分类:数学 2014-10-31 问题解答: 我来补答 49(x+y)²-9(x-y)²=(7x+7y+3x-3y)(7x+7y-3x+3y)=(10x+4y)(4x+10y)=4(5x+2y)(2x+5y)(x²-5)²+8(x²-5)+16 =(x²-5+4)²=(x²-1)²=(x-1)²(x+1)² 展开全文阅读