(1+1/2+1/3+...+1/99)×(1/2+1/3+1/4+...+1/100)—(1+1/2+1/3+1/4+
(1-1/2)(1-1/3)(1-1/4).(1-1/99)(1-1/100)等于?
(-1*1\2)+(-1\2*1\3)+(-1\3*1\4)+.+(-1\99*1\100)
1;(1-1/2^2)(1-1/3^2)(1-1/4^2)````````````(1-1/99^2)(1-1/100^
(1+1/1*3)*(1+1/2*4)*(1+1/3*5).(1+1/98*100)*(1+1/99*101)
(1+1/1+3)*(1+1/2*4)*(1+1/3*5)*.*(1+1/98*100)*(1+1/99*101)
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
[(2*2+4*4+6*6+...+100*100)—(1*1+3*3+...+99*99)]/(1+2+3+...+1
1-1/2+1/3-1/4+1/5-1/6…+1/99-1/100)/(1/51+1/52+1/53+…+1/99+1/
(1):1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100=?
(-1)^1+(-1)^2+(-1)^3+(-1)^4+…+(-1)^99+(-1)^100
1/1*2*3+1/2*3*4+1/3*4*5+...+1/99*100*101
1/1*2*3+1/2*3*4+1/3*4*5+.1/99*100*101