Đáp án:+Giải thích các bước giải:
39,2 x 27 + 39,2 x 43 + 78,4 x 15
= 39,2 x 27 + 39,2 x 43 + 39,2 x 2 x 15
= 39,2 x 27 + 39,2 x 43 + 39,2 x 30
= 39,2 x ( 27 + 43 + 30 )
= 39,2 x 100
= 3920
$39,2 × 27 + 39,2 × 43 + 78,4 × 15$
$= 39,2 × 27+ 39,2 × 43 + 39,2 × 2 × 15 $
$= 39,2 × 27 + 39,2 × 43 + 39,2 × 30$
$= 39,2 × ( 27 + 43 + 30)$
$= 39,2 × 100$
$= 3920$
$@YuuSaji$
c) (x – 2) mũ2 – (x + 5)(x – 5) = 10 d) 3(x – 0,1) – 0,2(x – 16,5) = 1
II. Find the phrases which have the CLOSEST meaning with the underlined words 1.We can use either verbal or non - verbal forms of communication. A. using gesture B. using speech C. using verbs D. using facial expressions 2. Polluted water causes the death of many species. A. clean B. contaminated C. purified D. strengthened 3. Drinking water must be purified so that it doesn't harm our health. A. Filtered B. Contaminated C. Impure D. Tested 4.Thanh Hoa is well-known for its beautiful beaches and seafood. A. rich B. successful C. honest D. famous 5.What do you like doing in your spare time? A. enjoyable B. free C. quiet D. busy 6. It takes me 15 minutes to get ready. A. to prepare B. to wake up C. to go D. to get up III. Find the words/ phrases which have the OPPOSITE meaning with the underlined words 1. The villagers agreed to sell frogs. A. did not B. not C. denied D. stopped 2. What music is serious and traditional Western European music? A. uncommon B. incorrect C. impossible D. irregular 3. Why does the monitor always go to class on time? A. lately B. late C. sometime D. sometimes 4. If I had been you, I would have gone home immediately. A. late B. lately C. short D. shortly
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Cho hai hàm số y = 3x và y = -x + 4. a) Vẽ trên cùng một mặt phẳng tọa độ đồ thị của hai hàm số đa cha. b) Gọi M là giao điểm của hai đường thẳng trên. Tìm tọa độ điểm M bằng phương pháp đại số
Tìm y: 27,5 - y x 3 = 9,05 mong các bạn giúp
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III. Read the text and do the tasks Anything good about natural disasters? Everyone agrees that a lot of bad things come (1) ……………… natural disasters. No one can (2) ……………… that the death and destruction most disasters leave behind are horrific. (3) ………………, there are also several good things that can come out of a disaster. In 2008, wildfires burned nearly 5.5 million acres across the United States. Yet the truth is that those wildfires actually (4) ……………… larger wildfires from happening. They (5) ……………… remove layers of dead underbrush that provide the fuel for forest fires. Wildfires also put nutrients back in the forest soil. Fire can also (6) ……………… unwanted invasive plants. Finally, animals are often attracted to the tender new growth in fresh burnt areas. When volcanoes (7) ………………, they belch out ash, steam, and magma. On the other hand, volcanoes created Iceland and the Hawaiian and Galapagos Islands. Volcanic ash also creates fertile soil for crops. Volcanoes can also (8) ……………… geothermal power. Power (9) ……………… are built to capture volcanic steam. The steam is used to (10) ……………… energy. Then it provides another solution to our country’s energy problems. Choose the best answer. 1. A. in B. with C. up D. over 2. A. tell B. agree C. deny D. accept 3. A. Nevertheless B. Because C. Although D. Since 4. A. encourage B. push C. prevent D. avoid 5. A. make B. give C. help D. need 6. A. eliminate B. increase C. decrease D. encourage 7. A. start B. begin C. occur D. erupt 8. A. give B. make C. generate D. offer 9. A. plant B. plants C. tree D. trees 10. A. create B. generate C. produce D. all are correct Decide if the statements are true (T) or false (T). 1. According to the writer, natural disasters bring us some benefits. 2. The occurrence of wildfires can help reduce the number of large forest fires. 3. Wildfires worsen the forest soil. 4. The formation of some islands created volcanic eruptions. 5. A type of power is generated after volcanic eruptions.
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