19/15 1/6
1/3 6 4
6/5 4/5
22/3 1/30
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追答12/15+7/15=19/15 3/6-2/6=1/6
5和5约了 3和9约了后分母只剩3分子是1 18和3约了是6 6乘以2等于12 刚算错了 2除以1/2=2乘以2等于4
分母分子约分后是2/5+4/5=6/5 1/2+3/10+2/5=5/10+3/10+4/10=12/10=6/5刚又错了……
(10/15+12/15)除以1/5=22/15乘以5=22/3 2/5乘以(10/12-9/12)=2/5×1/12=1/30
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追答真心没空 这你都看不懂 还是好好上课听讲吧!