70.1-41.89+2.78怎样简便运算

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70.1-41.89+2.78怎样简便运算
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70.1-41.89+2.78怎样简便运算
70.1-41.89+2.78怎样简便运算

70.1-41.89+2.78怎样简便运算
70.1-41.89+2.78
=70.1+2.78-41.89
=72.88-41.89
=72.88-41.88-0.01
=30.99

原式=72.88-41.89=30.99应该没有更简单的。其实都差不多。方法。