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x/6 - 1/y = 1/2
=> 1/y = x/6 - 1/2
=> 1/y = x-3/6
=> 6 = y(x - 3)
bn tự xét bảng là ra
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1. Vì 3\(⋮\)a-2
\(\Rightarrow\)a-2 thuộc Ư(3)
\(\Rightarrow\)a-2 thuộc {-1;-3;1;3}
\(\Rightarrow\)a thuộc {1;-1;3;5}
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(2^x=8\)
⇔ \(2^x=2^3\)
⇒ \(x=3\)
b) \(3^x=27\)
⇔ \(3^x=3^3\)
⇒ \(x=3\)
c) \(\left(-\dfrac{1}{2}\right)x=\left(-\dfrac{1}{2}\right)^4\)
⇔ \(x=\left(-\dfrac{1}{2}\right)^4\div\left(-\dfrac{1}{2}\right)\)
⇔ \(x=\left(-\dfrac{1}{2}\right)^3\)
d) \(x\div\left(-\dfrac{3}{4}\right)=\left(-\dfrac{3}{4}\right)^2\)
⇔ \(x=\left(-\dfrac{3}{4}\right)^2\cdot\left(-\dfrac{3}{4}\right)\)
⇔ \(x=\left(-\dfrac{3}{4}\right)^3=-\dfrac{27}{64}\)
d) \(\left(x+1\right)^3=-125\)
⇔ \(\left(x+1\right)^3=\left(-5\right)^3\)
⇔ \(x+1=-5\)
⇔ \(x=-5-1=-6\)
2:
a: (x-1,2)^2=4
=>x-1,2=2 hoặc x-1,2=-2
=>x=3,2(loại) hoặc x=-0,8(loại)
b: (x-1,5)^2=9
=>x-1,5=3 hoặc x-1,5=-3
=>x=-1,5(loại) hoặc x=4,5(loại)
c: (x-2)^3=64
=>(x-2)^3=4^3
=>x-2=4
=>x=6(nhận)
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1. It was warm, so I took off my coat. (take).
2. The film wasn't very goor. I didn't enjoy it very much. (enjoy)
3. I knew Sarah was very busy, so I ..... her (disturb)
4. I was very tired, so I ..... the party early. (leave)
5. The bed was very uncomfortable. I ..... very well (sleep)
6. The window was open and a bird ..... into the room (fly)