1\()\)\(\sqrt{49x^2-24x+4}\);  2\()\)\(\sqrt{x^2-9}\)

1)\(\sqrt{4z^2+4x+1}\);  2)\(\sqrt{\dfrac{12x+5}{\sqrt{3}}}\);  3)\(\sqrt{\left(3x+2\right)\left(x-1\right)}\); 4)\(\dfrac{16x-1}{\sqrt{x-7}}\);  5)\(\sqrt{\dfrac{\sqrt{6}-4}{m+2}}\);

6)\(\sqrt{3x-2}×\sqrt{x-1}\)

Dạng 2: Tìm điều kiện xác định của các biểu thức chứa căn:

Phương pháp tìm điều kiện: √A xác định A \(_{\ge0}\)

Cần lưu ý: Phân thức \(\dfrac{A}{B}\) xác định khi B≠ 0

1)\(\sqrt{x^2+2x+1}\);  2)\(\sqrt{\dfrac{1}{4}-2a}\);  3)\(\sqrt{\dfrac{-3}{2+x}}\);  4)\(\sqrt{\left(x+5\right)^2}\);  5)\(\sqrt{\dfrac{\sqrt{6}-4}{m+2}}\);  6)\(\dfrac{16x-1}{\sqrt{x}-7}\);

7)\(\sqrt{2x+5}\);  8)\(\dfrac{3}{\sqrt{12x-1}}\);  9)\(\sqrt{\sqrt{5}-\sqrt{3x}}\);  10)\(\sqrt{\sqrt{6x}-4x}\);  11)\(\sqrt{(\sqrt{x}-7)(\sqrt{x}+7)}\);  12)\(\sqrt{(x-6)⁶}\);  13\()\)\(\sqrt{-12x+5}\);  14\()\)2-4\(\sqrt{5x+8}\);  15\()\)\(\sqrt{\dfrac{-2\sqrt{6}+\sqrt{23}}{-x+5}}\);  16\()\)\(\sqrt{2011-m}\);  17)\(\sqrt{\dfrac{2\sqrt{15}-\sqrt{59}}{x-7}}\);  18)\(\sqrt{4z^2+4z+1}\);  19)\(\sqrt{49x^2-24x+4}\);  20)\(\sqrt{\dfrac{12x+5}{\sqrt{3}}}\);  21)\(\sqrt{x^2-9}\);  22\()\)\(\sqrt{(3x+2)(x-1)}\);  23)\(\sqrt{3x-2}.\sqrt{x-1}\).

1. a) 2√5-5√2 và 1; b) √8/3 và 3/4.

III.Rewrite the sentences, using the word given.

1.Could you please tell me the way to the market, please? (mind)

......................................................................................................................................2.Why don't we go out for a dinner tonight? (what about)

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3.My daughter likes history. (intersted)

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4. You should play outdoors to develop your social skills. (ought to)

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5."Don't forget to do your homework at home,'' he said to me. (told)

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6.Did you usually wear T-shirt when you were at shool?

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7.To get to the countryside on weekends is wonderful.

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8.Your idea is similar to mine.

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9.My uncle doesn't play football anymore.

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10.Tom's brother is too young to go to work.

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II.Correct the mistakes in the following sentences.

1.Jane and Tom wish they are good doctors.

......................................................................................................................................2.The washing machine was too heavy that I couldn't move

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3.You must do the test careful.

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4.Spring is a time when people often feel health.

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5. You can see a lot of cows with buffaloes on your away.

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6.Do you have a collecting of stamps?

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7.Alice doesn't know what to make a fire.

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8.In Spring, the village looks as a carpet with plenty of colors.

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9.My uncle and his children are not to come to dinner with us tonight.

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10.The city is much many pleasant to live in.

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E. WRITE 

I. Complete each of the following sentences, using the words given

1.Tom and Dorothy/ be/ going/visit/Ha Noi/tomorrow.

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2.It/ be/ kind/you/ invite us/birthday party/this evening.

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3.There /shrine/mountain/ near/ Paker's/village.

............................................................................................................................4.Peter/ said/me/enjoyed/play/video games.

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5.I/have/wonderful time/because/people/friendly.

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6.My/home village/about/20 kilometers/ south-west/capital

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7.There/small/bamboo forest/entrance/village.

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8.You/should attempt/answer/everyquestion.

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9. Alice/be/such/talented/woman/everybody/admire.

............................................................................................................................10. Mr.Smith/his family/usually/get/village/weekends.

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