15.3+6.14-15.3+6.14 用简便方法计算

问题描述:

15.3+6.14-15.3+6.14 用简便方法计算

15.3+6.14-15.3+6.14
=15.3-15.3+6.14+6.14
=0+12.28
=12.28
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