1/12×0.625+5/8×5/12+1/2÷(8/5)巧算
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1/12×0.625+5/8×5/12+1/2÷(8/5)
=1/12×5/8+5/8×5/12+1/2×5/8
=(1/12+5/12+1/2)×5/8
=1×5/8
=5/8
=1/12×5/8+5/8×5/12+1/2×5/8
=(1/12+5/12+1/2)×5/8
=1×5/8
=5/8
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