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b, 3x-5\(\sqrt{3x+2}\)=-6 (ĐK:x≥\(\dfrac{-2}{3}\))

⇔3x-5\(\sqrt{3x+2}\)+6=0

Đặt \(\sqrt{3x+2}\)=t (t≥0) ⇒ 3x=t\(^2\)-2 

⇒ta có pt: t\(^2\)-2-5t+6=0

               ⇔ t\(^2\)-5t+4=0

               ⇔t(t-1)+4(t-1)=0

               ⇔ (t-1)(t+4)=0

               ⇔t=1 hoặc t=-4(koT/m)⇔t=1(T/m)

               ⇔3x+2=1⇔3x=-1⇔x=\(\dfrac{-1}{3}\)(TM). Vậy x=\(\dfrac{-1}{3}\)

1. l am always given a present on my birthday by my mother.

2. He said to me if he could borrow me 100,000 dong.

3. Peter said that he was looking forward to his grandfather's gift.

4. I wish l had a computer.

5. He runs faster than l do.

6. ln spite of being tired, John finished his homework.

B

1D, 2C

1A

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