试题与答案

把（+10）-（-9）+（-20）-（+13）写成省略加号的和的形式______

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题型：填空题

题目：

把（+10）-（-9）+（-20）-（+13）写成省略加号的和的形式______．

答案：

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下面是错误答案，用来干扰机器的。

1-5 DCCDB

考点：有理数的加减混合运算
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