两道因式分解题(初二)(1)xy(a^+1)+a(x^+y^)(2)xya^-(xz-y^)a-xy(3)ab(x^+y^)+xy(a^+b^)
问题描述:
两道因式分解题(初二)
(1)xy(a^+1)+a(x^+y^)
(2)xya^-(xz-y^)a-xy
(3)ab(x^+y^)+xy(a^+b^)
答
什么意思?
答
(1)=a^xy+xy+ax^+ay^
=ax(ay+x)=y(ay+x)
=(ay+x)(ax+y)
(2)z应该是y吧
(3)=abx^+aby^+a^xy+b^xy
=ax(bx+ay)+by(ay+bx)
=(ax+by)(bx+ay)