1/1×2+1/2×3+1/3×4+...+1/99×100
(-1*1\2)+(-1\2*1\3)+(-1\3*1\4)+.+(-1\99*1\100)
(1-1/2)(1-1/3)(1-1/4).(1-1/99)(1-1/100)等于?
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
1;(1-1/2^2)(1-1/3^2)(1-1/4^2)````````````(1-1/99^2)(1-1/100^
1+2+3+4+.99+100+99+98+97.+1
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
(1 ) (1-2)*(2-3)*(3-4)*.*(99-100)
1*1*1+2*2*2+3*3*3+4*4*4+.+99*99*99*+100*100*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)
1/1×2+1/2×3+1/3×4+1/4×5+.+1/98×99+1/99×100=?