看等式都有0.73的尾数，而括号里是+所以我们先把括号去掉就非常简便了
15.73-(3.74+5.73)
=15.73-3.74-5.73
=15.73-5.73-3.74
=10-3.74
=6.26
=15.73－5.73_3.74
＝10_3.74
计算如下：
15.73-(3.74+5.73)
=15.73-5.73-3.74
=10-3.74
=6.26
15.73-(3.74+5.73)
=15.73-3.74-5.73
=15.73-5.73-3.74
=10-3.74
=6.26
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