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這兩個x是不一樣的 這個x和函數裡面的x是不一樣的, 這個x=√x+1,先看看化簡: 令a=√x+1 x=(a-1)^2 所以f(a)=(a-1)^2+2(a-1)的絕對值 其實函數是這個,其中a=√x+1 注意哈注意 為了方便同學們的習慣所以將其中的a直接換成x 明白了吧!
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