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$3^{x +1 } - 9^{x} = x -1$ . vậy thôi ạ

Sửa 03-12-14 09:54 AM

Đức Vỹ
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Hỏi 03-12-14 01:18 AM

hakunzee5897
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1 Đáp án

Thời gian Bình chọn

Bình chọn tăng 1 Bình chọn giảm

Bài này khá đơn giản nhé!

Pt $\Leftrightarrow 3^{x+1}+x+1=3^{2x}+2x$

Xét $f(t)=3^t+t$ thì $f'(t)>0$

$f(x+1)=f(2x)\Leftrightarrow x+1=2x\Leftrightarrow x=1$

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