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=?

来源：学生作业帮助网编辑：作业帮时间：2024/11/17 16:32:18

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=?
1/52+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=?

1/52+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=?
原式=51×50/52×51×50+50×49/52×51×50+49×48/52×51×50+48×47/52×51×50+.2×1/52×51×50=﹙51×50＋50×49＋49×48＋48×47＋.＋2×1﹚／52×51×50
因为 1×2=1×2×3×1／3 2×3=1／3×﹙2×3×4-1×2×3﹚ 3×4=1／3×﹙3×4×5－2×3×4﹚
4×5=1／3×﹙4×5×6－3×4×5﹚.51×50=1／3×﹙50×51×52－49×50×51﹚
所以1×2＋2×3＋3×4＋4×5＋.＋50×51=1／3×(1×2×3＋2×3×4－1×2×3＋3×4×5－2×3×4...) =
1／3×50×51×52
所以原式=1／3
不知道我计算过程有没有失误.

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×...×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=? 48*49*51*52怎么简便计算 48;49;50;51;52;53 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 46、47、48、49、50、51、52、53、54、55 46-47-48-49-50-51-52-初二英语 48 49 50 51 52 53 54题 48+49+50+51+52+53=?简便方法 50 49 51 52 48 的平均数是什么? 46、47、48、49、50、51、52题怎么做? 用简便方法计算49+51+53+47+48+50+49+52+46+51+54+55+51+53+47+50+49+51+56+48的和 47、49、50、53、51、49、48、51、52、50的众数41、52、59、48、50、57、51、58、41、43的众数呢? 为什么选这..49*50*51*52 49、50、51、52页全部答案. 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, 49°48'52''/4怎么算? 第46,47,48,49,50,51,52,53,54,55,56,57