7又13/15×4/11+12×1/11+2/11×4/15简便计算,
问题描述:
7又13/15×4/11+12×1/11+2/11×4/15简便计算,
答
7又13/15×4/11+12×1/11+2/11×4/15
=7又13/15×4/11+3×4/11+4/11×2/15
=(7又13/15 + 3 + 2/15)×4/11
=11×4/11
=4