36×72+86×72+122×28等于多少,要算式
问题描述：
36×72+86×72+122×28等于多少,要算式
答
36×72+86×72+122×28
=72×（36+86）+122×28
=72×122+122×28
=122×（72+28）
=122×100
=12200