问题标题:
寻找规律解数学题1/1*2=1-1/22/2*3=1/2-1/31/3*4=1/3-1/4……计算:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6=探究:1/1*2+1/2*3+1/3*4+……+1/n(n+1)=若1/1*3+1/3*5+1/5*7+……+1/(2n-1)(2n+1)的值为17/35,求n的值.(“/”此为除号,“*
问题描述:
寻找规律解数学题
1/1*2=1-1/22/2*3=1/2-1/31/3*4=1/3-1/4……
计算:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6=
探究:1/1*2+1/2*3+1/3*4+……+1/n(n+1)=
若1/1*3+1/3*5+1/5*7+……+1/(2n-1)(2n+1)的值为17/35,求n的值.
(“/”此为除号,“*”此为乘号)
2/2*3=1/2-1/3不好意思,打错了,应该是1/2*3=1/2-1/3
施长治回答:
探究:1/1*2+1/2*3+1/3*4+……+1/n(n+1)=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/n-1/(n+1))=1/1-1/2+1/2-1/3+1/3-1/4+...+1/n-1/(n+1)=1/1-1/(n+1)=n/(n+1)1/1*3+1/3*5+1/5*7+……+1/(2n-1)(2n+1)=1/2*[(1/1-1/3)...
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