1＋1×2＋1×2×3＋1×2×3×4＋....1×2×3×4×5×6×7×8×9
的值的個位數是多少？
有簡解嗎？
2005-01-30 12:57:50 · 4 個解答 · 發問者 ? 5 in 教育與參考 ➔ 考試
個位數的和
1+1x2+1x2x3+1x2x3x4+1x2x3x4x5+1x2....x6+...........+1x2x3x.......x8x9
1 +2+ 6 + 4 + 0 + 0 + 0
= 1+2+6+4
= 3
2005-01-30 13:02:10 · answer #1 · answered by HRM 6 · 0⤊ 0⤋
用工程式ㄉ
答案我案過ㄋ
是3!!!!!!!!
2005-01-30 18:21:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
1！+2！+3！+ ... 9！=1(1！)+2(2！)+6(3！)+24(4！)+120(5！)+720(6！)+5040(7！)+40320(8！)+362880(9！) = 409,113
2005-01-30 13:27:03 · answer #3 · answered by 最美的晨曦 3 · 0⤊ 0⤋
1+1*2+1*2*3+1*2*3*4+1*2*3*4*5+1*2*3*4*5*6+1*2*3*4*5*6*7+1*2*3*4*5*6*7*8+1*2*3*4*5*6*7*8*9=1+2+6+24+120+520+3640+29120+262080
尾數部分就是1+2=3因為6+24=0
2005-01-30 13:13:18 · answer #4 · answered by 眾人皆醒我獨醉 3 · 0⤊ 0⤋