7/13×5/8 2/13×7/16-1/13×7/2的简便算法?
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7/13×5/8+2/13×7/16-1/13×7/2
=7/13×5/8+7/13×2/16-7/13×1/2
=7/13×(5/8+2/16-1/2)
=7/13×(5/8+1/8-4/8)
=7/13×2/8
=7/13×1/4
=7/52
=7/13×5/8+7/13×2/16-7/13×1/2
=7/13×(5/8+2/16-1/2)
=7/13×(5/8+1/8-4/8)
=7/13×2/8
=7/13×1/4
=7/52
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