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-1+6/5-12/7+20/9-11/30+13/42-15/56+17/72等于多少?
题目详情
-1+6/5-12/7+20/9-11/30+13/42-15/56+17/72等于多少?
▼优质解答
答案和解析
=-1+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)
=-1+1/2+1/9
=11/18
=-1+1/2+1/9
=11/18
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