(4m+2n)(2m+4n)点解会得出4(2m+n)(m+2n)
问题描述:
(4m+2n)(2m+4n)点解会得出4(2m+n)(m+2n)
为什么会提4出来呢,
答
(4m+2n)(2m+4n)
=[2(2m+n)][2(m+2n)]
=2×2(2m+n)(m+2n)
=4(2m+n)(m+2n)