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5/6-7/12+9/20-11/30+...-99/2450=?
题目详情
5/6-7/12+9/20-11/30+...-99/2450=?
▼优质解答
答案和解析
5/6-7/12+9/20-11/30+...-99/2450
=(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+...-(1/49+1/50)
=1/2-1/50
=24/50
=12/25
=(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+...-(1/49+1/50)
=1/2-1/50
=24/50
=12/25
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