计算(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)
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![计算(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)](/uploads/image/z/445446-54-6.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%88-1.8%EF%BC%89%2B%EF%BC%88%2B0.7%EF%BC%89%2B%EF%BC%88-0.9%EF%BC%89%2B%EF%BC%88%2B1.3%EF%BC%89%2B%EF%BC%88-0.2%EF%BC%89)
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计算(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)
计算(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)
计算(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)
(-1.8)+(+0.7)+(-0.9)+(+1.3)+(-0.2)
=-1.8+0.7-0.9+1.3-0.2
=-1.8-0.2+0.3+1.7-0.9
=-2+2-0.9
=0-0.9
=-0.9
-0.9
-0.9
-0.9