作业帮1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
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1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
=(1/50-1/51)+(1/51-1/52)+(1/52-1/53)+(1/53-1/54)+(1/54-1/55)
=1/50-1/51+1/51-1/52+1/52-1/53+1/53-1/54+1/54-1/55
=1/50-1/55
=1/550
5
1/52+49/52×51+49×48/52×51×50+.+49×...×1/52×...×3=?
1/50*51+1/51*52+.+1/99*100
1/50*51+1/51*52+1/52*53+1/53*54+1/54*55
50×51/1+51×52/1+52×53/1+53×54/1+54×55/1
1/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+...+47*46*45*...*2*1/52*51*50*...*6*51/52+47/52*51+47*48/52*51*50+47*46*45/52*51*50*49+.+47*46*45*.*2*1/52*51*50*.*6*5
1/52+49/52×51+49×48/52×51×50+.+49×...×1/52×...×3=?1/52+49/52×51+49×48/52×51×50+.+49×...×1/52×...×=?1/52+49/52×51+49×48/52×51×50+......+49×...×1/52×...×3=?
1+2+3+.+50-51-52-53-.-100(简便）
17/51+[(1/68)+(2/52)]x17
(1+1/51)*(1-1/51)*(1+1/52)*(1-1/52)*.*(1+1/152)*(1-1/152)
50×51分之1+51×52×53分之1+53×54分之1+54乘55分之1
计算：50×51分之1+51×52分之1+52×53分之1+...+58×59分之1+59×60分之1等于?
(1/1+2)+(1/1+2+3)+...+(1/1+2+3+4+...+50) = (1+1/51)*(1-1/51)*(1+1/52)*(1-1/52)*...*(.)*(1-152/1)错了，=就是分隔符，分别求答
51 52
1+2+3+.+50-51-52-53-.-100qi nian ji
有理数 51页至52页的 复习题1
50+51+52+.+6541=?
计算下列数字方阵所有各数得和1,2,3,.48,49,50,2,3,4,.49,50,51,3,4,5,.50,51,52,...50,51,52,.97,98,99,
（1+1/51）*（1-1/51）*（1+1/52）*（1-1/52）*···*（1+1/152）*（1-1/152）=?