1/9*10+1/10*11+...+1/59*60
3个回答
=1/9-1/10+1/10-1/11+……+1/59-1/60
=1/9-1/60
=17/180
相关问题
10*11份1+11*12份1+……59*60份1
1/(10+11)+1/(11+12)+1/(12+13)+1/(13+14)+```1/(59+60)=
问:1-2/9*10+2又2/10*11+3又2/11*12+.+51又2/59*60
(1/8+1/9+1/10+1/11)*(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+
59除〖1除(10分之1-9%)〗
8*1/9+9*1/10+10*1/11+...+99*1/100=?
(1)8*9/1+9*10/1+10*11/1+.99*100/1
59÷[1÷(10/1-9%)] 的巧算
10,8,11,9,1,10,(),()
11...1×99...9(10个1,10个9)