Question

一乘一乘二乘三一直乘到一千九百九十九怎么算?

最好有过程,有简便算法最好!

Answer 1

1999的阶乘= 165,8137546225,3166205876,9669028816
2019140558,6040528901,9728596771,8530190389,5280041120
,0136615429,8662961277,0117647061,2917054629,0424087076
4689806569,3316763171,8444528170,2927808197,0302558626
,2859353239,2819677202,2702621978,7335188370,5436148521
7342079171,8762157904,3876682256,3743997718,4296237040
,1620447328,0753616625,3263988278,7858983576,8359344679
5280564079,3580085861,6328578055,0021070062,1021692128
,6856350087,9417738984,4996064176,4498332926,7027899274
5182868317,5066693275,2005860060,7631774401,9134076076
,1234604976,0301578220,9282740337,9732485257,7614410261
7449997863,2254070327,6833948476,6050733811,3356660134
,1577610259,7247230809,1196376020,1326486131,5751287376
0241480323,7546369708,2928141765,8897872414,3815729822
,5186995663,6670886318,0442624504,6753310805,0722298547
0635391065,6866281915,7861510099,7495747915,8235471387
,2369351639,9277483714,9304419688,1634120762,3941719373
4797914628,8702872699,1875079290,7734068147,1089749861
,9990679974,0508278281,9380171136,5645612519,2354936454
8133112309,8553830296,5775100947,5677915826,7893574614
,5458389524,8511235473,0596880389,2582555342,2161279528
2436813326,5188692325,1953940247,6230035627,4701307283
,0361270681,5137745683,5791703048,9155374726,4110874539
0673854846,6207780556,6991402567,9300345297,3099826286
,5537058854,0759961282,2583892857,2902830109,2827380476
1887315083,3971124422,2242899174,9007740163,1041494548
,2928690875,9443096883,4641413994,4226792319,9482971069
7649223264,5546004551,8550230747,2495791429,4025380933
,9624731925,9043993725,6445704009,6700373129,6002854936
4789299821,8253279478,0620511550,9345278030,1543918145
,5525280062,2954499191,7053996839,5102603842,9334591738
9532792723,5007434632,8462315966,6688062140,4871003358
,6423180969,6248493142,3435999672,5196944683,6352435635
8636728085,0177433738,7545514777,6197677397,0553710956
,6506784097,7054597073,1383208771,0807938126,3142904490
0611221945,1243385910,2747970787,5995850635,8837858937
,4793080983,2965939427,5709178910,4630074103,5888665867
6980171524,8454103529,4979350690,9904065177,9508038145
,4194287280,6441088490,6809124178,8369609151,5592073595
6699344642,1172000389,6233456048,8336582571,6747218736
,6178182860,2442223916,5927470846,5150622658,3811637268
3939661423,7369122425,4614156997,6254866252,9895635155
,2384180074,0595551114,6266863488,4691183502,8782806200
1452880219,2642645146,8803239766,7290898330,6191980263
,1274553593,3319346773,8305422752,3099051042,0253179138
3826329474,6196624759,8429770858,3620966476,5341836747
,7720022931,7991908052,1529724913,3137653027,1179037794
7054139440,2139129755,4494031770,5283958975,4870088903
,4439143490,5109505450,0741760308,4444186012,5155332961
0343007418,2491526639,1044131768,2790218028,4339064208
,4608566523,5705881560,8794788856,1318792376,5617586154
9527491460,5067343652,1029490072,0903193769,1332084948
,8521188797,0314043862,6851132713,2652904311,8965071133
7910593571,7514593188,1817015008,6625909131,0380198736
,8479760132,1316182072,7234255567,1360107522,9191925505
0684706565,1742811095,8315811946,3163829076,7750563815
,3912529984,5794122667,2871771893,1841586865,3366482946
7759984722,9118436754,4151393288,5043987494,4996171777
,7831203414,1738189234,2591922486,8244369762,3755161211
1055280600,6479148285,9568405434,6912737882,0594434396
,7336259562,3096075572,3694181347,9582183624,5035826714
1140763306,2390023196,1272472585,1818618139,7037889227
,1045524152,7308280953,1108714349,0801486662,0232601009
9640692744,1340975503,6414348505,3536875046,3833243751
,0873876863,7117575437,4123360137,0850157905,6140294808
9061080373,7189737554,7531046927,8337290626,2591883410
,7885640393,0749627938,0661764752,1117319393,9477425442
8822330681,4519706383,2989022101,0461406689,9355795044,
8132439471,2066052274,6250178333,5316454720,7896864933
7171073525,3606794466,0097903615,3239074921,4761297794
,5063774119,8588666286,1455162880,4648953666,4977252819
4181320237,3251225404,0473455803,6316043747,0719865003
,5205570929,7765139413,6788274095,9100122484,8880555673
1590976413,8079548209,4895479058,6693136030,4445521647
,2622489267,5735070562,2107152774,3044819789,1891736626
6179788164,5719462644,1969931281,3662143138,7781570231
,9151945842,1081655672,2818154785,9829892331,6927574615
8098167837,6775692017,1290208145,9918911133,4547608850
,7658766936,5142305420,9432770691,6458597566,6058947864
2708310424,1184140896,6256465618,7607709634,8513485164
,9738821911,6932415044,3576518670,2833191934,1470442438
6536088113,4424511542,4673305971,3009013630,6901054002
,5391078705,0302742410,0673929789,0513853538,9032775638
6270250837,1661980331,2660820750,2404386201,5238059645
,1610507719,2676569342,7692432127,8539539767,0588259785
5943418699,4034194789,6371874841,7490714616,4609815488
,8545071968,4218276666,7965391009,0656496727,5121030222
8167028930,3481235980,7528016974,4976166090,0217179983
,6283119635,9821770143,6027737506,0399271659,8533739865
6563406761,8268720428,3113160338,4418792566,3914481261
,6664217090,6488812348,5397717180,0174617157,9619837381
8194560576,4270332889,1823106955,6237235256,2761317135
,0619763509,0635227458,2402296612,4054429337,3004761533
9658798387,7790505839,9700026249,0315188157,0672206134
,5185174936,7789995800,4629624037,5262427707,8413314088
0407723154,1527033387,0631506222,0932102054,1865595465
,6500057723,5280138886,8621890335,9444988542,5528363638
3906235994,1642884792,2108794447,5802339341,0240500502
,3908231179,1104192662,4406713541,7039934243,3160813601
0441165436,3909542689,4227345657,7801086443,6560953696
,9826046301,1455073876,3540465432,6824899292,7700528872
5139644907,3018442159,1075431862,3108483936,1410846736
,8529964313,8556223845,4604514941,6008341508,5136710129
8828358549,3165560817,4751085632,2134135598,2513202711
,4115879815,4372376509,2359704776,2131705749,2347540366
9504000000,0000000000,0000000000,0000000000,0000000000
,0000000000,0000000000,0000000000,0000000000,0000000000
0000000000,0000000000,0000000000,0000000000,0000000000
,0000000000,0000000000,0000000000,0000000000,0000000000
0000000000,0000000000,0000000000,0000000000,0000000000
,0000000000,0000000000,0000000000,0000000000,0000000000
0000000000,0000000000,0000000000,0000000000,0000000000
,0000000000,0000000000,0000000000,0000000000,0000000000
0000000000,0000000000,0000000000,0000000000,0000000000
,0000000000,0000000000,0000000000,0000000000,0000000000