1 volcanic

2 asleep

3 weatherman

4 by-land

 

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Ta có: \(2x+2\left\{-\left[-x-3\left(x-3\right)\right]\right\}=2\)

\(\Leftrightarrow2x+2\left\{-\left[-x-3x+9\right]\right\}=2\)

\(\Leftrightarrow2x+2\left\{x+3x-9\right\}=2\)

\(\Leftrightarrow2x+8x-18=2\)

\(\Leftrightarrow10x=20\)

hay x=2

Vậy: x=2

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Akai Haruma
4 phút trước

Yêu cầu đề bài là gì thế bạn?

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traitimtrongvang
17 phút trước

\(a)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ 2C_2H_2 + 5O_2 \xrightarrow{t^o} 4CO_2 + 2H_2O\\ b)\\ V_{CH_4} =a (lít) ; V_{C_2H_2} = b(lít)\\ \Rightarrow a + b = 7,84(1)\\ V_{O_2} = 2a + \dfrac{5}{2}b = 21,28(2)\\ (1)(2) \Rightarrow a = -3,36 < 0 ; b = 11,2\)

(Sai đề)

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I thought I recognized the assistant which served us. => who

2) The twentieth century was the time when there was a lot of important events.  => were

3) Tom has got the job. You must congratulate him for his success. => on

4) The cooker who is in the kitchen doesn't work anymore.=> cook

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