题目
题型：解答题难度：一般来源：不详
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答案
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=
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核心考点
举一反三
（1）0-（+8）+（-2.7）-（+5）；
（2）-3.92+6.24-8.56+4.28；
（3）0.25+
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（4）-
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①-23+（-37）-（-12）+45； ②（
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