1-2/5+3/7 7/10-(1/2-1/3) 11/12-(3/4-7/30) 这些都是简算
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1-2/5+3/7
=3/5+3/7
=3×(1/5+1/7)
=3×12/35
=36/35
7/10-(1/2-1/3)
=7/10-1/2+1/3
=1/5-1/3
=2/15
11/12-(3/4-7/30)
=11/12-3/4+7/30
=1/6+7/30
=2/5
=3/5+3/7
=3×(1/5+1/7)
=3×12/35
=36/35
7/10-(1/2-1/3)
=7/10-1/2+1/3
=1/5-1/3
=2/15
11/12-(3/4-7/30)
=11/12-3/4+7/30
=1/6+7/30
=2/5
更多追问追答
追问
1-2/5+3/7
=1-2/5+3/7
=5/5-5/2+3/7
=3/5+3/6
=36/35
这样简算可以吗
追答
1-2/5+3/7
=1-2/5+3/7
=5/5-5/2+3/7
=3/5+3/6
=36/35
3/5+3/6=36/35???
错误啊
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