把(+5)+(-12)-(-8)-(+9)写成省略括号形式.

问题描述:

把(+5)+(-12)-(-8)-(+9)写成省略括号形式.

(+5)+(-12)-(-8)-(+9)
=5-12+8-9

5-12+8-9

(+5)+(-12)-(-8)-(+9)
=5-12+8-9
= -8