標題:
F1.求-5,10,-15,20...通項
發問:
F1.求-5,10,-15,20...通項.
T(1) = -5 = (-1) * 5 * 1 T(2) = 10 = (-1)^2 * 5 * 2 T(3) = 15 = (-1)^3 * 5 * 3 T(4) = 20 = (-1)^4 * 5 * 4 ..... 通項 T(n) = (-1)^n * 5 * n 2011-03-20 11:51:42 補充: T(3) = -15
其他解答:
F1.求-5,10,-15,20...通項
發問:
F1.求-5,10,-15,20...通項.
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最佳解答:T(1) = -5 = (-1) * 5 * 1 T(2) = 10 = (-1)^2 * 5 * 2 T(3) = 15 = (-1)^3 * 5 * 3 T(4) = 20 = (-1)^4 * 5 * 4 ..... 通項 T(n) = (-1)^n * 5 * n 2011-03-20 11:51:42 補充: T(3) = -15
其他解答:
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