脱式计算:1/3÷7/9×5/6 12/5÷(3/4+1/3)-1/3 15÷[5/7×(2/3-1/5)]
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1.1/3÷7/9×5/6
=1/3*9/7*5/6
=3/7*5/6
=5/14
2.12/5÷(3/4+1/3)-1/3
=12/5÷13/12-1/3
=5/13-1/3
=2/39
3.15÷[5/7×(2/3-1/5)]
=15÷[5/7×7/15]
=15÷1/3
=45
=1/3*9/7*5/6
=3/7*5/6
=5/14
2.12/5÷(3/4+1/3)-1/3
=12/5÷13/12-1/3
=5/13-1/3
=2/39
3.15÷[5/7×(2/3-1/5)]
=15÷[5/7×7/15]
=15÷1/3
=45
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