解答

✨ 最佳解答 ✨

f(1) = 5
f(x+1) = f(x) + 2

看起來很複雜,其實只是要我們把數字套進去。

f(2) = f(1) + 2 = 5 + 2 = 7
f(3) = f(2) + 2 = 7 + 2 = 9
f(4) = f(3) + 2 = 9 + 2 = 11

f(4) - f(1) = 11 - 5 = 6

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