15.7-4.3+3.54+4.3简便计算

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15.7-4.3+3.54+4.3简便计算15.7-4.3+3.54+4.3简便计算15.7-4.3+3.54+4.3简便计算=15.7+3.54-(4.3-4.3)=15.7+3.54=19.24请

15.7-4.3+3.54+4.3简便计算
15.7-4.3+3.54+4.3简便计算

15.7-4.3+3.54+4.3简便计算
=15.7+3.54-(4.3-4.3)
=15.7+3.54
=19.24
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