2/1+(3/1+3/2)+(4/1+4/2+4/30+(5/1+5/2+5/3+5/4)+...(50/1+50/2+
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/29 20:33:47
2/1+(3/1+3/2)+(4/1+4/2+4/30+(5/1+5/2+5/3+5/4)+...(50/1+50/2+50/3+...50/49)等于多少?
![2/1+(3/1+3/2)+(4/1+4/2+4/30+(5/1+5/2+5/3+5/4)+...(50/1+50/2+](/uploads/image/z/521017-25-7.jpg?t=2%2F1%2B%283%2F1%2B3%2F2%29%2B%284%2F1%2B4%2F2%2B4%2F30%2B%285%2F1%2B5%2F2%2B5%2F3%2B5%2F4%29%2B...%2850%2F1%2B50%2F2%2B)
n/1+n/2+……+n/(n-1)
=n/[2/n(n-1)]
=2/(n-1)
所以原式=2/1+2/2+2/3+……+2/49
=2/(1+2+……+49)
=2/1225
=n/[2/n(n-1)]
=2/(n-1)
所以原式=2/1+2/2+2/3+……+2/49
=2/(1+2+……+49)
=2/1225
2/1+(3/1+3/2)+(4/1+4/2+4/30+(5/1+5/2+5/3+5/4)+...(50/1+50/2+
1/2+(1/3+2/3)+1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+...+(1/50+2/50+
2/1+(3/1+3/2)+(4/1+4/2+4/3)+(5/1+5/2+5/3+5/4)+.+(50/1+50/2+.
计算1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/50+2/50
1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/50+.+49/5
1.1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+3/5+4/5+...+49/50
1 2 3 4 5
.1,2,3,4,5,
5/(2*1)+5/(2*3)+5/(3*4)……5/(49*50)等于多少
1/2×3+1/3×4+1/4×5+……+1/49×50
2*3/1+3*4/1+4*5/1+.+50*51/1等于多少
1/2*3 + 1/3*4 + 1/4*5 + .1/49*50