5/6=1/2+1/3,7/12=1/3+1/4,9/20=1/4+1/5.利用上面的规律计算 1+1/2-5/6+7/
2个回答
1+1/2-5/6+7/12-9/20+11/30-13/42
=1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)
=1-1/7
=6/7
相关问题
计算,①31/50+4/5-9/20②3/4-5/12+2/3③1-1/6-1/3-1/2④3/8+(7/12+5/6)
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