1/2+1/3+2/3+1/4+2/4+3/4+……+99/100
=1/2+2/2+3/2+...+99/2
=(1+2+...+99)/2
=(99*100/2)/2
=2475.
很高兴为您解答,【曾飞非】为您答疑解惑
如果本题有什么不明白可以追问,再详细一点,没看懂1/n+2/n+...+(n-1)/n=[1+2+...+(n-1)]/n=[n(n-1)/2]/n=(n-1)/2
猜你喜欢
- 1一批本子分发给六年级一班学生,平均每人分到12本.若只发给女生,平均每人可分到20本,若只发给男生,平均每人可分得_本.
- 2Mum,could you buy me a dress like this?
- 3the studen has to help his feiends with math变为否定句
- 4真核细胞原核细胞的区别,
- 5已知向量a=(1,−2),b=(1+m,1−m),若a∥b,则实数m的值为( ) A.3 B.-3 C.2 D.-2
- 6某人沿直线做单方向运动,由A到B的速度为v1,由B到C的速度为v2,若AB=BC,则这全过程的平均速度是( ) A.v1−v22 B.v1+v22 C.v1−v2v1+v2 D.2v1v2v1+v2
- 7She ______ the homework yesterday.A.didn't do B.didn't C.doesn't D.doesn't do
- 8若有以下宏定义:#define N 3 #define Y(n) ((N+1)*n) ,执行语句“z=2*(N+Y(5+1));”后,Z的值是?
- 9are.there.10 storybooks.in.desk.the.连词成句
- 10一根铁丝,第一次用去二分之一米,第二次用去的长度是第一次的3倍,两次共用去全长的四分之三.这跟铁丝全长多少米?