8.40+8.56+8.61+8.39 简便计算

问题描述:

8.40+8.56+8.61+8.39 简便计算

= 25.96

8.40+8.56+8.61+8.39
=(8.40+8.56)+(8.61+8.39)
=16.96+17
=33.96