2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/30 02:14:13
![2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)](/uploads/image/z/5431378-58-8.jpg?t=2%2B3%2B%EF%BC%88-7.5%EF%BC%89%2B%EF%BC%88-3%EF%BC%89%2B5%2B%EF%BC%88-8%EF%BC%89%2B3.5%2B4.5%2B8%2B%EF%BC%88-1.5%EF%BC%89)
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2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)
2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)
2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)
2+3+(-7.5)+(-3)+5+(-8)+3.5+4.5+8+(-1.5)
=2+3+【(-7.5)+(-1.5)】+【(-3)+5+(-8)】+【3.5+4.5】+8
=5-9+8+8
=12
按顺序算负号的前面是加就去加改负为减,前是减号就是负负得正!22