Bài 1: b) \(\dfrac{7x}{2x+2}=\dfrac{3x+1}{x-5}\)     (2)

ĐK: \(\left\{{}\begin{matrix}2x+2\ne0\\x-5\ne0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ne-1\\x\ne5\end{matrix}\right.\)

(2)⇒ \(\dfrac{7x\left(x-5\right)}{\left(2x+2\right)\left(x-5\right)}=\dfrac{\left(3x+1\right)\left(2x+2\right)}{\left(2x+2\right)\left(x-5\right)}\)

\(\Leftrightarrow7x^2-35x=6x^2+6x+2x+2\)

\(\Leftrightarrow7x^2-35x-6x^2-6x-2x-2=0\)

\(\Leftrightarrow x^2+27x-2=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-27+\sqrt{737}}{2}\\x=\dfrac{-27+\sqrt{737}}{2}\end{matrix}\right.\left(TM\right)\)

KL:

sorry! câu này mih làm sai mất rồi

Bài 1:

a) \(\dfrac{5x-6}{2x-1}=\dfrac{3x}{x-2}\)      (1)

ĐK:\(\left\{{}\begin{matrix}2x-1\ne0\\x-2\ne0\end{matrix}\right.\) ⇔\(\left\{{}\begin{matrix}x\ne\dfrac{1}{2}\\x\ne2\end{matrix}\right.\)

(1) ⇒\(\dfrac{\left(5x-6\right)\left(x-2\right)}{\left(2x-1\right)\left(x-2\right)}=\dfrac{3x\left(2x-1\right)}{\left(2x-1\right)\left(x-2\right)}\)

⇔\(5x^2-10x-6x+12=6x^2-3x\)

⇔\(5x^2-10x-6x+12-6x^2+3x=0\)

⇔\(-x^2-13+12=0\)

⇔\(\left[{}\begin{matrix}x=\dfrac{-13+\sqrt{217}}{2}\\x=\dfrac{-13-\sqrt{217}}{2}\end{matrix}\right.\left(TM\right)\)

KL:

REWRITE THESE SENTENCES AS DIRECTED.

We don't live in the city, so we can't easily get access to the internet.

⇒If..........................................................................................................

CHOOSE THE BEST ANSWER.

1. If I had been her, I wouldn't  go out at night with him.

            A                           B                   C                     D

2. If he pased the exam, his parents weren't so sad.  

                            A                B                  C            D

3. She will buy a new house if she saved enough money but she doesn't have

               A                             B           C           D

enough money.

4. If my sister were in your position, she hadn't behave such a stupid thing.

                         A          B                                  C                      D

5. If I have | enough money, I'd buy | a car. But I don't have enough money.

          A            B                         C            D  

CHOOSE THE BEST ANSWER.

1. If it ( didn't rain / isn't rain / doesn't rain / won't rain), my flowers will die.

2. If I (had had / have had / would have / had) breakfast, I wouldn't have been ill.

CHANGE THE SENTSNCES INTO THE PASSIVE VOICE.

1. The teacher said,''All the homework must be done carefully''.

.........................................................................................................

2. Mai said,''I cannot go to the movies with you, Nam''.

.........................................................................................................

3. ''I must go home to make the dinner'', said Mary.

............................................................................................................

4. ''This story happened long ago'' he said.

............................................................................................................

5. The porter said to me, '' I'll wake you up, when the train arrives in

Leeds.''

.............................................................................................................

6. My wife said to me: ''While you are away, I'll do the packing.''

...............................................................................................................

7. ''After he leaves hospital, they'll take him to the Soyth, ''he doctor said.

...................................................................................................................

8. ''They'll wait for the fisherman to return until it gets dark, ''the local man explained to me.

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giải pt: \(\sqrt{2x-3}-\sqrt{x}=2x-6\)