用简便算法计算（15.2-9.9)-(4.3-2.54）

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用简便算法计算（15.2-9.9)-(4.3-2.54）
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用简便算法计算（15.2-9.9)-(4.3-2.54）
用简便算法计算（15.2-9.9)-(4.3-2.54）

用简便算法计算（15.2-9.9)-(4.3-2.54）
(15.2-9.9)-(4.3-2.54)
=(15.2-(10-0.1))-((4+0.3)-2.54)
=(15.2-10+0.1)-4-0.3+2.54
=5.3-0.3-4+2.54
=3.54

没怎么看懂，你的意思是怎么口算么 （15.2-10+0.1）-（4.54-2.54-0.24）=3.54

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