5/6-7/12+9/20-11/30+13/42怎么简算?
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5/6-7/12+9/20-11/30+13/42怎么简算?
5/6-7/12+9/20-11/30+13/42怎么简算?
5/6-7/12+9/20-11/30+13/42怎么简算?
5/6-7/12+9/20-11/30+13/42
=1/2+1/3-(1/3+1/4)+1/4+1/5-(1/5+1/6)+1/6+1/7
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7
=1/2+1/7
=9/14