用提公因式法分解因式a(m-3)+3(3-m)

问题描述:

用提公因式法分解因式a(m-3)+3(3-m)

a(m-3)+3(3-m)
=a﹙m-3﹚-3﹙m-3﹚
=﹙m-3﹚﹙a-3﹚

a(m-3)+3(3-m)
=a(m-3)-3(m-3)
=(a-3)(m-3)