Choosen As Best Answer

1.
h25 = h1 + 24d = 5
h40 = h1 + 39d = 8
兩式相減可得 15d = 3, d = 1/5
h1 = 5 - 24/5 = 1/5
(1)
h99 = h1 + 98d = 1/5 + 98/5 = 99/5 #

(2)
總面積 = 0.4*(h1 + h2+ ... + h98 + h99)
= 0.4* [ (1/5 + 99/5)*99/2 ]
= 0.4 * 990 = 396 #

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2.
數列:
1, 2, 0, 1, 2, 0, 1, 2, 0, ...
平方之後:
1, 4, 0, 1, 4, 0, 1, 4, 0, ...
三個一組的話 1 + 4 + 0 = 5
106 / 5 = 21 ... 1 => 21 組再多一個
每一組有三個數字 => 21*3 + 1 = 64 #

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