1/50*51+1/51*52+.+1/99*100
1/50*51+1/51*52+.+1/99*100
1+2+3+.+50-51-52-53-.-100
(1+1\2*3+1\3*5+1\4*7+.+1\50*99)\(1\51+1\52+1\53+.+1\100)怎么解?
(50+51+52.+99+100)-(1+2+3.+59+58)
1/52+49/52×51+49×48/52×51×50+.+49×...×1/52×...×3=?
50×51/1+51×52/1+52×53/1+53×54/1+54×55/1
1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
1/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+...+47*46*
1-1/2+1/3-1/4+1/5-1/6…+1/99-1/100)/(1/51+1/52+1/53+…+1/99+1/
50*51,51*52,52*53.98*99,99*100的倒数和
49*50+50*51+51*52+52*53+……99*100=
100^3+99^3/100^3+1^+99^3+97^3/99^3+2^3……+51^3+1^/51^3+50^3=?