Đáp án:
$-3\sqrt[]{2}-1$
Giải thích các bước giải:
$\sqrt[]{2}-2\sqrt[]{8}+\sqrt[]{6-2\sqrt[]{5}}-\sqrt[]{5}$
$=\sqrt[]{2}-2\sqrt[]{2^2.2}+\sqrt[]{(\sqrt[]{5}-1)^2}-\sqrt[]{5}$
$=\sqrt[]{2}-4\sqrt[]{2}+|\sqrt[]{5}-1|-\sqrt[]{5}$
$=-3\sqrt[]{2}+\sqrt[]{5}-1-\sqrt[]{5}$
$=-3\sqrt[]{2}-1$
Đáp án+Giải thích các bước giải:
`a)\sqrt{2}-2\sqrt{8}+\sqrt{6-2\sqrt5}-\sqrt5`
`=\sqrt2-2.2\sqrt2+\sqrt{(\sqrt5-1)^2}-\sqrt5`
`=\sqrt2-4\sqrt2+\sqrt5-1-\sqrt5`
`=-3\sqrt2-1`
Read the dialogue. Choose the best answer (A, B, C or D) to complete the dialogue. A: I’ve got my bike, so I’m going ______________(0) in the mountains tomorrow. What about you? B: Well, these mountain roads are too (1) _____I don’t think I’m (2____enough to ride my bike along them. A: It’s perfectly safe. B: No, it’s not. It’s really (3)______________. We could fall down the mountain. A: You won’t fall. And the views from the top are (4)____________. B: No, I think I’ll just go (5)_____________in the old castle. A: quiet walk will be more (6)___________than going into the mountains. 0. A. surfing B. skiing C. cycling D. sailing 1. A. dangerous B. boring C. great D. difficult 2. A. scary B. brave C. exciting D. excited 3. A. lovely B. scary C. active D. scared 4. A. horrible B. healthy C. amazing D. amazed 5. A. sightseeing B. surfing C. snorkeling D. swimming 6. A. beautiful B. crazy C. enjoyable D. enjoying
Giải được câu nào giải giúp mình với ạ 5 sao đúng
toán 9một chiếc máy bay đang cất cánh từ sân bay đường bay lên tạo với phương nằm ngang một góc 35 độ hỏi sau khi bay được quảng đường 10km thì bay ở độ cao bằng baom nhiêu km so với mặt đất
giúp mình gấp vớiii ạ, mình thật sự cần gấp...
Use the correct form of the words in brackets to complete the sentences. 1. We went on a really ___________ holiday last year. (ADVENTURE) 2. We visited the ___________part of the island. (SOUTH) 3. Look! There’s that __________actor ! (FAME) 4. This bed is not very______________ . I can’t sleep on it. (COMFORT)2 5. The concert tickets are too_______________ for me. (EXPENSE) 6. Be careful, the roads are very ________________today. (ICE) 7. You shouldn’t eat so many burgers. They’re not __________ . (HEALTH) 8. We had a _________________ holiday last year. (WONDER)
Cho tam giác ABC vuông tại A có đường cao AH. Gọi E, F lần lượt là hình chiếu vuông góc của H lên AB, AC. CMR: a) $AB^{3}$ = BE . $BC^{2}$ b) $\sqrt[3]{BE^{2}}$ + $\sqrt[3]{CF^{2}}$ = $\sqrt[3]{BC^{2}}$
Giúp tui với đang cần gấp lắm ó
giải giúp mình với mình đang cần gấp
Read the sentences. Choose the best answer (A, B, C or D) to complete the sentences. 1. We _____________ part in an international student conference. A. took B. put C. did D. had 2. My friend went to a ______________ school because her parents lived in another country. A. secondary B. boarding C. comprehensive D. grammar 3. We booked a hotel room with ____________ board so we had all our meals at the hotel. A. room B. full C. shared D. empty 4. The man got ___________the car and drove away. A. off B. into C. on D. out 5. I’ve taken _____________ a new hobby – surfing. I love it. A. out B. up C. over D. on 6. They put _____________ an excellent play at the school last summer. A. on B. up C. off D. into 7. The school disco takes __________ in the school hall. A. care B. part C. place D. out 8. Would you like to have ____________ schooling? A. house B. home C. own D. private 9. Every morning I prepare a _______________ lunch to take to school. A. packet B. package C. packed D. pack 10. After school I have to take ____________ of my little sister until mum gets home. A. care B. out C. place D. part
số đo hai góc trong cùng phía có quan hệ gì đặc biệt ?
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