(2分之1-3分之1+6分之1)*12
=1/2*12-1/3*12+1/6*12
=6-4+2
=4
(12+7分之6)/5分之6
=12*5/6+6/7*5/6
=10+5/7
10又7分之5
8分之9*7+8分之7*7
=(9/8+7/8)*7
=2*7
=14
9分之7+5分之1+9分之7+4分之5
=7/9+7/9+1/5+5/4
=14/9+4/20+25/20
=14/9+29/20
=280/180+261/180
=541/180
6分之5+(6分之1+3分之2)
=5/6+1/6+2/3
=1+2/3
=5/3
15分之11-(3分之2+1)
=11/15-2/3-1
=11/15-10/15-1
=1/15
(2分之1-3分之1+6分之1)*12
=1/2*12-1/3*12+1/6*12
=6-4+2
=4
(12+7分之6)/5分之6
=12*5/6+6/7*5/6
=10+5/7
10又7分之5
8分之9*7+8分之7*7
=(9/8+7/8)*7
=2*7
=14 就这
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