a) tìm số hữu tỉ a để a + $\frac{1^2}{a^2}$ là SND b) $\frac{1}{\sqrt{b_1}}$ + $\frac{1}{\sqrt{b_2}}$ +…+ $\frac{1}{\sqrt{b_{100}}}$ =20. CMR trong dãy số đã cho có ≥ 2 số bằng nhau. Cảm được mik tick nha

Read the following passage text then answer the questions by choosing option A,B,C or D Water is one of our most important natural resources. We need (56) ________ it daily to stay alive. We also use water for cooking, cleaning and, of course,(57) ________ and swimming-and for making skating rinks in winter! Water is vital to our economy, too-from growing food to running factories. We also turn the energy of moving water-like Niagara Falls-into (58) _________ power.Like electricity, we expect to have good,clean water at the turn of the tap. It has to travel to us and, after we use it, water (59) ________ and returned to its source-usually nearby rivers or lakes. All of this activity takes energy. Saving water means saving energy. The less water you (60) _______, the less energy is used to pump,treat,distribute and recover it. 56. A. drink B. to drink C. drinking D. drank 57. A. splashing B. splash C. to splash D. splashed 58. A. electric B. geothermal C. hydroelectric D. solar 59. A. treated B. is treated C. treating D. is treating 60. A. use B. using C. are using D. in use

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VI. Make questions for the underlined part in each sentence. ( use Wh- words) 1. I like (TV game shows) best. ......................................................................................................... 2. TV viewers can know (about the weather in their regions) from the weather forecast. ......................................................................................................... 3. We go to the zoo (twice a month). ......................................................................................................... 4. We can meet in front of the theater (at 7.30.) ......................................................................................................... 5. Bob likes the comedy (because it makes him laugh.) ......................................................................................................... 6. The documentary lasts (forty-five minutes.) ......................................................................................................... 7.(Steven Spielberg) is the director of the film. ......................................................................................................... 8. On VTV3, there are (three films) on this week. ......................................................................................................... 9. (Millions) of children around the world enjoy the cartoon "Hello Fatty!" ......................................................................................................... 10. Pokémon cartoons are made (in Japan.) .........................................................................................................

Read and fill a suitable word in each blanket: (5.0 points) The word’s (51)________ famous clock is Big Ben standing next to the Houses of parliament in London. Big Ben is the name of the bell which chimes every hour. The bell (52) _______ named after Sir Benjamin Hall, the man (53) ______ was given the task of hauling the bell up the clock tower. The clock has four faces and keeps accurate time. It can be adjusted by the removal or addition of coins (54) _________ a stray attached to the clock’s pendulum. One interesting thing about the clock is that the light shines above the Belfry at night, It (55) ______ that the House of common is still in session.

b) Tìm giá trị lớn nhất (GTLN) của biểu thức B =13/4-( 3x-6/5)

Một ô tô dự định chạy từ A đến B trong một thời gian nhất định. Nếu xe chạy với vận tốc 50km/h thì đến B muộn so với dự định 30 phút. Nếu xe chạy với vận tốc 60km/h thì đến B sớm hơn so với dự định là 30 phút. Tính thời gian dự định đi và quãng đường AB. giúp vs ak

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