59x7/58+57x5/58简便算法怎么做
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0oShmily2o0,
59×7/58+57×5/58
=(58+1)×7/58+(58-1)×5/58
=58×7/58+1×7/58+58×5/58-1×5/58
=7+7/58+5-5/58
=12+2/58
=12又1/29
59×7/58+57×5/58
=(58+1)×7/58+(58-1)×5/58
=58×7/58+1×7/58+58×5/58-1×5/58
=7+7/58+5-5/58
=12+2/58
=12又1/29
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