来自冷画屏的问题
因式分解(3m+2n)2-4(m-n)2
因式分解(3m+2n)2-4(m-n)2
1回答
2020-04-25 20:32
因式分解(3m+2n)2-4(m-n)2
因式分解(3m+2n)2-4(m-n)2
(3m+2n)²-4(m-n)²
=(3m+2n)²-2²(m-n)²
=(3m+2n)²-(2m-2n)²
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)