(3m+2n)²-4(m-n)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 11:38:23
![(3m+2n)²-4(m-n)²](/uploads/image/z/5590345-49-5.jpg?t=%EF%BC%883m%2B2n%EF%BC%89%26%23178%3B-4%EF%BC%88m-n%EF%BC%89%26%23178%3B)
x){8W(N5eCsk]P.B&Hev64VJDjB8F@D4W#W/.H̳:́) 3 ³0Մhgmdb(v)VA==> ѐ
(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²
=(3m+2n-2m+2n)(3m+2n+2m-2n)
=5m(m+4n)
(3m+2n+2(m-n))(3m+2n-2(m-n))=(5m)(m+4n)=5m^2+20mn
(3m+2n)²-4(m-n)²
=(3m+2n)²-(2m-2n)²
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)