標題:

通項數列```````

發問:

求數列7,8項數值: 6n+9 12n+2 4n+10 3n+6 6n-2 12n-3 4n-12 10n-8 求通項: 10,20,30,40,50 4,8,12,16,20 10,20,30,40,50 12,24,36,48,60 16,26,36,46,56 18,24,30,36,42 15,18,21,24,27 10,18,26,34,42

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最佳解答:

6n+9 7th : 51 8th : 57 12n+2 7th : 86 8th : 98 4n+10 7th : 38 8th : 42 3n+6 7th : 27 8th : 30 6n-2 7th : 40 8th : 46 12n-3 7th : 81 8th : 93 4n-12 7th : 16 8th : 20 10n-8 7th : 62 8th : 72 求通項: 10,20,30,40,50 =10n 4,8,12,16,20 =4n 10,20,30,40,50 =10n 12,24,36,48,60 =12n 16,26,36,46,56 =6 + 10n 18,24,30,36,42 =12+6n 15,18,21,24,27 =12+3n 10,18,26,34,42 =2+8n

其他解答:

求數列7,8項數值: T(n) = 6n + 9 T(7) = 6(7) + 9 = 51 T(8) = 6(8) + 9 = 57 -------------------------------- T(n) = 12n + 2 -------------------------------- T(n) = 4n + 10 T(7) = 4(7) + 10 = 38 T(8) = 4(8) + 10 = 42 -------------------------------- T(n) = 3n + 6 -------------------------------- T(n) = 6n - 2 T(7) = 6(7) - 2 = 40 T(8) = 6(8) - 2 = 46 -------------------------------- T(n) = 12n - 3 -------------------------------- T(n) = 4n - 12 -------------------------------- T(n) = 10n - 8 T(7) = 10(7) - 8 = 62 T(8) = 10(8) - 8 = 72 -------------------------------- 上面唔幫你做晒, 加加減減, 自己做得到 求通項: 10,20,30,40,50 T(n) = 10n -------------------------------- 4,8,12,16,20 T(n) = 4n -------------------------------- 10,20,30,40,50 -------------------------------- 12,24,36,48,60 T(n) = 12n -------------------------------- 16,26,36,46,56 T(n) = 10n + 6 -------------------------------- 18,24,30,36,42 T(n) = 12 + 6n -------------------------------- 15,18,21,24,27 T(n) = 12 + 3n -------------------------------- 10,18,26,34,42 T(n) = 2 + 8n -------------------------------- 2007-10-25 21:14:00 補充： 我做得正統 d, 記得投我一票
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