3分之1-7分之2
=7/21-6/21
=1/21
6分之5+12分之5
= 10/12+5/12
=15/12
=5/4
12分之7+4分之1
= 7/12+3/12
=10/12
=5/6
2分之1-6分之1
=3/6-1/6
=2/6
=1/3
3分之1-7分之2= 6分之5+12分之5= 12分之7+4分之1= 2分之1-6分之1=
3分之1-7分之2= 6分之5+12分之5= 12分之7+4分之1= 2分之1-6分之1=
数学人气：350 ℃时间：2020-04-07 17:54:16
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