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\(3^{x+4}=9^{2x-1}\)
\(\Rightarrow3^{x+4}=3^{4x-2}\)
\(\Rightarrow x+4=4x-2\)
\(\Rightarrow3x=6\Rightarrow x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
c: ⇔n+2∈{1;−1;5;−5}⇔n+2∈{1;−1;5;−5}
hay n∈{−1;−3;3;−7}n∈{−1;−3;3;−7}
d: ⇔n+2∈{1;−1;2;−2;4;−4}⇔n+2∈{1;−1;2;−2;4;−4}
hay n∈{−1;−3;0;−4;2;−6}n∈{−1;−3;0;−4;2;−6}
a: ⇔n−1∈{1;−1;5;−5}⇔n−1∈{1;−1;5;−5}
hay n∈{2;0;6;−4}
b: \(\Leftrightarrow n+1\in\left\{1;-1;2;-2;4;-4\right\}\)
hay \(n\in\left\{0;-2;1;-3;3;-5\right\}\)
c: \(\Leftrightarrow n+2\in\left\{1;-1;5;-5\right\}\)
hay \(n\in\left\{-1;-3;3;-7\right\}\)
d: \(\Leftrightarrow n+2\in\left\{1;-1;2;-2;4;-4\right\}\)
hay \(n\in\left\{-1;-3;0;-4;2;-6\right\}\)
a: \(\Leftrightarrow n-1\in\left\{1;-1;5;-5\right\}\)
hay \(n\in\left\{2;0;6;-4\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
exs1
1 don't have to
3 mustn't
7 don't have to
exs2
3 might
4 can't
7 might be
còn nữa ...
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![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 3:
a: \(\Leftrightarrow n+2\in\left\{1;-1;7;-7\right\}\)
hay \(n\in\left\{-1;-3;5;-9\right\}\)