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7/19x3/8x6/29x7/12+3/29x7/9简便算法
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7/19x3/8x6/29x7/12+3/29x7/9简便算法
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答案和解析
7/29x3/8+6/29x7/12+3/29x7/9
=3/29×7/8+3/29×7/6+3/29×7/9
=3/29×7×（1/8+1/6+1/9）
=21/29×29/72
=7/24
=3/29×7/8+3/29×7/6+3/29×7/9
=3/29×7×（1/8+1/6+1/9）
=21/29×29/72
=7/24
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