3/10+1/9-12/70
怎样简便就怎样计算.
3/14+5/7+1/21 11/9-7/18-2/3 3/10+4/5-14/15 5/14-（3/10-1/5）
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第1个回答 2019-06-25
3/14+5/7+1/21 =9/42+30/42+2/42=41/42 11/9-7/18-2/3 =22/18-7/18-12/18 =1/6 3/10+4/5-14/15=9/30+24/30-28/30=1/6 5/14-（3/10-1/5)=5/14-3/10+1/5=25/70-21/70+14/70=9/35
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