Question

因式分解 9（2m+n）²-4（m-2n）平方 （要过程哦，真的很急）

Answer 1

9(2m+n)^2-4(m-2n)^2
=[3(2m+n)]^2-[2(m-2n)]^2
=[3(2m+n)+2(m-2n)][3(2m+n)-2(m-2n)]
=(8m-n)(4m+7n)

Answer 2

原式=[3(2m+n)]²-[2(m-2n)]²
=(6m+3n)²-(2m-4n)²
=[(6m+3n)+(2m-4n)][(6m+3n)-(2m-4n)]
=(8m-n)(4m+7n)