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5/12÷8+1/8×7/12
=5/12×1/8+1/8×7/12
=1/8×(5/12+7/12)
=1/8×1
=1/8
12/5×(4/15+2/5)-3/5
=12/5×(4/15+6/15)-3/5
=12/5×2/3-3/5
=8/5-3/5
=1
3/8÷[(1/2+1/3)×3/10]
=3/8÷[(3/6+2/6)×3/10]
=3/8÷(5/6×3/10)
=3/8÷1/4
=3/8×4
=3/2
=1又1/2
=5/12×1/8+1/8×7/12
=1/8×(5/12+7/12)
=1/8×1
=1/8
12/5×(4/15+2/5)-3/5
=12/5×(4/15+6/15)-3/5
=12/5×2/3-3/5
=8/5-3/5
=1
3/8÷[(1/2+1/3)×3/10]
=3/8÷[(3/6+2/6)×3/10]
=3/8÷(5/6×3/10)
=3/8÷1/4
=3/8×4
=3/2
=1又1/2
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