Cho tứ giác ABCD,có góc B =46 độ, góc C =80 độ,gócD =2gócA tính góc A và D
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
NH
5
DT
25 tháng 11 2024
km/h sang m/s : ?km/s chia cho 3,6
m/s sang km/h : ?m/s nhân cho 3,6
DT
4
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
26 tháng 11 2024
\(x.\left(y-3\right)\) = 6 (mới đúng em nhé)
6 = 2.3 ⇒ Ư(6) = {-6; -3; -2; -1; 1; 2; 3; 6}
Lập bảng ta có:
| \(x\) | -6 | -3 | -2 | -1 | 1 | 2 | 3 | 6 |
| y - 3 | -1 | -2 | -3 | -6 | 6 | 3 | 2 | 1 |
| y | 2 | 1 | 0 | -3 | 9 | 6 | 5 | 4 |
Theo bảng trên ta có:
(\(x;y\)) = (-6; 2); (-3; 1); (-2; 0); (1; 9); (3; 5); (6; 4)
Kết luận: Vậy các cặp \(x;y\) nguyên thỏa mãn đề bài là:
(\(x;y\)) = (-6; 2); (-3; 1); (-2; 0); (1; 9); (3; 5); (6; 4)
25 tháng 11 2024
21.ngon
22.cha
23.em
24.đen
25.non
26.cha
27.rào
28.sắt-kim
29.em nâng
SV
Sinh Viên NEU
CTVVIP
26 tháng 11 2024
1. I like / football / the rain. / playing / in ......I like playing football in the rain.............................................................................................
2. the / are / in / My toy / brown box. .......................My toys are in the brown box............................................................................
3. My uncle has to work hard from 5 in the morning at 7 in the evening.
4. Odd one out:
A. uncle
B. aunt
C. father
D. friend
5. He likes playing sports ... football and tennis.
A. such as
B. such like
C. sample
D. example
6. is / When / your / birthday? ........When is your birthday?.....................................................................................
7. me? / you / write / to / Can ..............Can you write to me?.....................................................................................
8. Is it a round box? – No, it is a square box.
9. Ha can dance but cannot play football.
10. What time is it? – It ... four fifteen.
A. is
B. has
C. at
D. in
SV
Sinh Viên NEU
CTVVIP
26 tháng 11 2024
11. Mr Smith / a lot of / grows / vegetable / in his garden. ..Mr Smith grows a lot of vegetable in his garden..............................................................................................
12. four seasons / our country. / in / are / There ........There are four seasons in our country...........................................................................................
13. How old is he? – He is 10 years old.
14. What a ... doll! My children like it very much.
A. better
B. lovely
C. awful
D. expensive
15. Don't write ... the walls.
A. on
B. at
C. in
D. to
16. and / dance. / swim / My brother / can ..........My brother can swim and dance.........................................................................................
17. Where / are / from? / you ..........Where are you from?.........................................................................................
18. There are five fingers is one hand.
19. My brother is seven years old.
20. your / please. / me / pen, / Show
Show me your pen, please
KN
5
Giải:
Xét tứ giác ABCD có:
\(\widehat{A}\)+ \(\widehat{B}\) + \(\widehat{C}\) + \(\widehat{D}\) = 3600(tổng bốn góc của tứ giác bằng 1800)
⇒ \(\widehat{A}\) + \(\widehat{D}\) = 3600 - \(\widehat{B}\) + \(\widehat{C}\)
⇒ \(\widehat{A}\) + \(\widehat{D}\) = 3600 - 460 - 800
⇒ \(\widehat{A}\) + \(\widehat{D}\) = 2340 (1)
Mặt khác: \(\widehat{D}\) = 2 x \(\widehat{A}\) (gt)
Thay \(\widehat{D}\) = 2 x \(\widehat{A}\) vào (1) ta có:
\(\widehat{A}\) + 2 x \(\widehat{A}\) = 2340
⇒ 3 x \(\widehat{A}\) = 2340
⇒ \(\widehat{A}\) = 2340 : 3
⇒ \(\widehat{A}\) = 780
Thay \(\widehat{A}\) = 780 vào \(\widehat{D}\) = 2 x \(\widehat{A}\) ta có:
\(\widehat{D}\) = 2 x 780
\(\widehat{D}\) = 1560
Vậy \(\widehat{A}\) = 780; \(\widehat{D}\) = 1560