1.25+4.6+0.75怎么简便运算？

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=（1.25+0.75）+4.6
=2+4.6
=6.6

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1.25+0.75再加4.6，1.25+0.75=2凑成整数，2+4.6就好算啦

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用加法交换律 先相加1.25 0.75

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