(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...×(1+1/99)×(1-1/99)=?
计算(1-2/3)*(1-2/4)*(1-2/5)*...(1-2/98)*(1-2/99)*(1-2/100).(用简
(1):1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100=?
(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/100+.99/100)=
1、(1+2/5)(1-2/5)(1+2/7)(1-2/7)*……*(1+2/99)(1-2/99)
1+(-2)+3+(-4)+5+(-6)+.+(+99)+(-100)=?
1/(1*2)+1/(2*3)+1*(3*4)+1/(4*5)……1/(98*99)+1/(99+100)=?
(-1)+2+(-3)+4.....+(-99)+100=?
计算:(100+99×1)+(99+99×2)+(98+99×3)+…+(2+99×99)+(1+99×100)=___
巧算(奥数题)问:(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...(1+1/99)×(1-1/99
(1-3/(2*4))×(1-3/(3*5))×(1-3/(4*6))×.×(1-3/(97*99))=?