Đáp án:
`M=3+\sqrt5`
Giải thích các bước giải:
`M=[\sqrt2-\sqrt{3-\sqrt5}].\sqrt2+\sqrt{20}`
`M=2-\sqrt{6-2\sqrt5}+\sqrt{4.5}`
`M=2-\sqrt{5-2\sqrt5+1}+2\sqrt5`
`N=2-\sqrt{(\sqrt5-1)^2}+2\sqrt5`
`M=2-(\sqrt5-1)+2\sqrt5`
`M=2-\sqrt5+1+2\sqrt5`
M=(√2−√3−√5)√2+√20 =2−√6−2√5+√4.5 =2−√5−2√5+1+2√5 =2−√(√5−1)2+2√5 =2−|√5−1|+2√5 =2−(√5−1)+2√5(do:√5−1>0) =2−√5+1+2√5 =√5+3
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The roof of the building _____________ in a storm a few days ago. Choose the correct answer for the blank in the sentence above. had been damaged was damaged has been damaged A severe tropical___________ is called a typhoon. Choose the correct answer for the blank in the sentence above. drought flood storm 26.If you were the president, what ____________you do to help the environment? Choose the correct answer for the blank in the sentence above. could should would 27.in Scotland, a person who __________ the bagpipes is called a bag-piper. Choose the correct answer for the blank in the sentence above. buys performs sells
Tìm x , biết : 8x² + 20x + 7 = 0
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Use these to build sentences: - Adventure - Join forces - Unite - For all ages
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Câu 1. Don't forget to bring an umbrella because it's gong to rain. A. You should to bring an umbrella. B. You mustn't bring an umbrella. C. You should bring an umbrella. D. You can't bring an umbrella. Câu 2. I often _____them when we lived next to their house two years ago. A. meets. B. meet. C. met. D. was met. Câu 3. Tom is ____ in his class. A. the talkative B. the more talkative C. the most talkative D. most talkative Câu 4. Sports and games ________ an important part in our lives. A. do B. play C. make D. has Câu 5. He has never _______any English novel before. A. reads B. read C. reading D. readed Câu 6. You need _______when going swimming. A. goggles B. paddles C. boat D. helmet Câu 7. We _____a wish for good health and long life in a new year. A. making B. make C. do D. are doing Câu 8. Choose the word whose underlined part is pronounouced differently. A. cleanED. B. washED. C. laughED. D. cookED. Câu 9. He started cycling around the lake 30 minutes ago. A. He has started cycling around the lake 30 minutes ago. B. He has cycled around the lake for 30 minutes. C. He has cycled around the lake for 30 minutes ago. D. He hasn't cycled around the lake for 30 minutes. Câu 10. My classmates___________trees on the fifth of January after Tet holiday. A. will to plant B. plants C. is planting D. are planting
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