Đáp án+Giải thích các bước giải:
Ta có: `OC` nằm giữa `2` tia `OA` và `OB`
`=> \hat{AOC}+\hat{COB}=\hat{AOB}`
hay `30^o``+\hat{COB}=120^o`
`=> \hat{COB}=120^o-30^o=90^o`
`=> OC bot OB`
Đáp án:
$\\$
Do `OC` nằm giữa `OA` và `OB`
`-> hat{AOC} + hat{BOC} = hat{AOB}`
`-> hat{BOC} = hat{AOB} - hat{AOC}`
`-> hat{BOC} = 120^o - 30^o`
`-> hat{BOC}=90^o`
hay `OB⊥OC`
Vậy `OB ⊥OC`
giải câu này ra giúp mình với ạ huhu:(((
phân tích nhân tử x*(y^2-z^2)+y*(z^2-x^2)+z*(x^2-y^2)
Theo em “nhân” và “thi gia” chỉ ai? Việc dùng từ “thi gia” ở câu thơ cuối của bài thơ Ngắm trăng có ý nghĩa gì?
mọi người ơi bài này là tìm giá trị nhỏ nhất nha giúp mình với
2. He said, “I don’t understand those two lessons at all.” He said that he…………………………………… 3. “I know those girls quite well,” Mary said. Mary said that she……………………………….. 4. “My secretary didn’t finish the work,” Mr. Johnson said that…………………………….. 5. “I can’t possibly finish the work by that time.” George said that………………………………….. 6. “I have been smoking too much recently.” Mr. Anderson said that…………………………… 7. “My entire trip cost me two thousand dollars,” Mr. Brown said that……………………………… 8. “I’m very busy,” She said that……………………………………… 9. “I’m having a bath,” She said that………………………………………. 10. “I must do my homework tonight,” He said to me that………………………………… 11. “I’m going away tomorrow.” He said that………………………………………… 12. “I enjoyed myself at the party last night,” Ann said that………………………………………. 13. ‘They were here three months ago.” He said that……………………………………….. 14. “I don’t like this film,” s He said that………………………………………… 15. “I haven’t been waiting long,” She said to me that…………………………
" i'll see and tell you the news tomorrow." she told me —> "Tell your teacher what happened," Jack advised me —> "Donnot go to the park when it gets dark," said Mrs.Brown —> Giúp với ạ
Mng giúp e vs ạ! Nếu ph vẽ hình thì vẽ hộ e luôn ạ
viết câu trả lời giúp tôi . thanks ! 1. what will you be doing at this time tomorrow? 2. Will you be sleeping in your bed when I come tomorrow? If not, what will you do? 3. what will your mother be cooking at 8:00 a. m. next Sunday? 4. who will you be going to school with at this time tomorrow? 5. will you be eating your dinner at 9:00 p. m. tonight 6. where will your father be visiting at 10 a. m. tomorrow THE END
BÀI 10: Dựa vào những từ cho sẵn, viết thành câu hoàn chỉnh. 1.We/ have/ breakfast/ when/ the mailman/ arrive. 2. While/ everyone/ sleep/ Paul/ watch/TV. 3. I/ dream/ about/ long/ vacation/ when/ the alarm clock/ go/ off. 4. While/ I/ practice/ the piano/ late/ last night,i/ hear/ strange/ noise. 5. The sheep/ graze/ in/ the/ filed/ when/ they/ be/ scared/ by/ the/ noise. 6. What/ you/ do/ when/ the earthquake/ happen/ yesterday? 7. I/ run/ to/ catch/ the bus/ when/ I/ see/ Jim. 8. When/ you/ meet/ James/ last night/ ,/ what/ he/ wear? 9. Some people/ chat/ while/ others/ play/ games/ at/ the party/ last/ night. 10. It/ rain/ at this time/ yesterday/ so/ we/ cancel/ the barbecue
Tìm x làm theo đẳng thức nha mn giúp em với nha em cần gấp em sẽ vote 5 sao
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
