4/(1*2*3)+7/(2*3*4)+.+(3n+1)/[n(n+1)(n+2)]急吖还有几个1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+...+n)=1/(根号下1+根号下2)+1/(根号下2+根号下3)+1/(根号下3+根号下4)+...+1/(根号下n+根号下n+1)=1/3+1/(3+5)+1/(3+5+7)+.+1/(3+5+7+...+2n+1)

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/20 08:44:41
4/(1*2*3)+7/(2*3*4)+.+(3n+1)/[n(n+1)(n+2)]急吖还有几个1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+...+n)=1/(根号下1+根号下2)+1/(根号下2+根号下3)+1/(根号下3+根号下4)+...+1/(根号下n+根号下n+1)=1/3+1/(3+5)+1/(3+5+7)+.+1/(3+5+7+...+2n+1)
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4/(1*2*3)+7/(2*3*4)+.+(3n+1)/[n(n+1)(n+2)]急吖还有几个1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+...+n)=1/(根号下1+根号下2)+1/(根号下2+根号下3)+1/(根号下3+根号下4)+...+1/(根号下n+根号下n+1)=1/3+1/(3+5)+1/(3+5+7)+.+1/(3+5+7+...+2n+1)
4/(1*2*3)+7/(2*3*4)+.+(3n+1)/[n(n+1)(n+2)]
急吖
还有几个
1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+...+n)=
1/(根号下1+根号下2)+1/(根号下2+根号下3)+1/(根号下3+根号下4)+...+1/(根号下n+根号下n+1)=
1/3+1/(3+5)+1/(3+5+7)+.+1/(3+5+7+...+2n+1)=

4/(1*2*3)+7/(2*3*4)+.+(3n+1)/[n(n+1)(n+2)]急吖还有几个1+1/(1+2)+1/(1+2+3)+.+1/(1+2+3+...+n)=1/(根号下1+根号下2)+1/(根号下2+根号下3)+1/(根号下3+根号下4)+...+1/(根号下n+根号下n+1)=1/3+1/(3+5)+1/(3+5+7)+.+1/(3+5+7+...+2n+1)
54

4/3-7/2＋4/1＋7/2 1/1,1/2,2/2,1/2,1/3,2/3,3/3,2/3,1/3,1/4,2/4,3/4,4/4,3/4,2/4,1/4,.7/10是第几个分数.第400 1、2、3、4、5、6、7 1,2,3,4,5,6,7, 1,2 ,3,4,5,6,7 1+2-3+4-5+6-7 7,1,2,3,4,5. 1 2 3 4 6 7 1+2+3+4+5+6+7 1,2,3,4,5,6,7 1+2+3+4+6+7+5 1,2,3,4,5,7题, 1、2、3、4、5、6、7 4*7分之2+3分之1 1,2,3,4,5,6,7 1、2、3、4、5、7、8 1×2×3×4×5×6×7 1+2+3+4+5+6+7