(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式
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(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式(-9)
(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式
(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式
(-9)-(-2)+(-7)-(+5)-(-4)写成省略加号形式
(-9)-(-2)+(-7)-(+5)-(-4)
=-9+2-7-5+4
=-15