(1-19/1)(1-20/1)(1-21/1)···(1-97/1)(1-98/1)(1-99/1)
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(1-19/1)(1-20/1)(1-21/1)···(1-97/1)(1-98/1)(1-99/1)
(1-19/1)(1-20/1)(1-21/1)···(1-97/1)(1-98/1)(1-99/1)
(1-19/1)(1-20/1)(1-21/1)···(1-97/1)(1-98/1)(1-99/1)
(1-19/1)(1-20/1)(1-21/1)···(1-97/1)(1-98/1)(1-99/1)
=18/19*19/20*20/21*……*96/97*97/98*98/99
=18/99
=2/11
|1/20-1/19|+|1/19-1/18|+|1/18-1/17|+.+|1/2-1|
(1+19/105*1)+(1+19/105*2)+(1+19/105*3)+.+(1+19/105*19)+(1+19/105*20)
1/2*1/3+1/3*1/4+1/4*1/5.+1/18*1/19+1/19*1/20
(1+19/105)+(1+19/105*2)+(1+19/105*3)+...+(1+19/105*20)
(1+1/2)*(1+1/3)*(1+1/4)*…*(1+1/18)*(1+1/19)*(1+1/20)
1/1*2+1/2*3+1/3*4+.+1/19*20+1/20*21
1*2/1+2*3/1+.+18*19/1+19*20/1
1/1*2+1/2*3+.1/18*19+1/19*20=?
1/2×3+1/3×4+1/4×5+.+1/18×19+1/19×20等于?
求1/2*3+1/3*4+1/4*5+.+1/18*19+1/19*20
简算1/2*3+1/3*4+1/4*5+.+1/18*19+1/19*20
1/2×3+1/3×4+1/4×5+.+1/18×19+1/19×20等于?
(1+1/2)x(1+1/3)x(1+1/4)x...x(1+1/19)x(1+1/20)
1-1/2+1/3-1/4+.+1/19-1/20 结果等于多少
1-1/2+1/3-1/4+.+1/19-1/20 怎样编写程序
19- (19/1-1)(20/1-1)(21/1-1)'''''''(97/1-1)
(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*…*(1-1/19)*(1-1/20)=
(1-1/19)(1-1/20)(1-1/21)(1-1/22)...(1-1/99)=