4/50*51+4/51*52+4/52*53……+4/99*100=
4/50*51+4/51*52+4/52*53……+4/99*100=
49*50+50*51+51*52+52*53+……99*100=
简便方法计算:(50乘51)分之4加(51乘52)分之4加(52乘53)分之4加……加(99乘100)分之4等于多少
1-1/2+1/3-1/4+1/5-1/6…+1/99-1/100)/(1/51+1/52+1/53+…+1/99+1/
52×51分之4
51*51+52*52+53*53+.+99*99=?
【1/(1*2)+1/(3*4)+1/(5*6)+1/(7*8)+……1/(99*100)】/(1/51+1/52+……
100,51)(100,52)(100,53)……(100,99)
(1+1\2*3+1\3*5+1\4*7+.+1\50*99)\(1\51+1\52+1\53+.+1\100)怎么解?
1+2+3+4+5+6+7+8````+50-51-52-53````-100+101+102````+150-151-
51^2+52^2+53^2+……+100^2=?
1/2*3+1/4*5+1/6*7+...+1/98*99+1/51+1/52+1/53+...1/99