13分之8除4乘6分之5
=2/13x5/6
=5/39
9分之5乘7分之6除6分之5
=5/9x6/7x6/5
=2/3x6/7
=4/7
30-1.6除15分之4
=30-6
=24
（6分之1+2分之1）除7分之2
=1/3x7/2
=7/6
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