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NT
1
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
7 tháng 8 2023
\(a,\widehat{aOn}+\widehat{mOn}+\widehat{mOb}=180^o\left(kề.bù\right)\\ \Leftrightarrow70^o+\widehat{mOn}+40^o=180^o\\ Vậy:\widehat{mOn}=180^o-\left(70^o+40^o\right)=70^o\\ b,Vì:\widehat{aOn}=\widehat{mOn}\\ Mà.tia.On.nằm.giữa.2.tia.Oa.và.Om.nên:\\ On.là.tia.phân.giác.góc.\widehat{aOm}\)
Giup mình với mình đang cần gấp
giup mình với mai mình thi rồi
31 tháng 8 2023
AF=FG=GC
=>AG=2/3AC
=>S ABG=2/3*S ABC
BE=ED=1/2AD
=>BE+ED=1/2AD+1/2AD=AD
=>BD=DA
=>D là trung điểm của AB
=>AD=1/2AB
=>BE=ED=1/4AB
AE=AD+DE=1/4AB+1/2AB=3/4AB
=>S AEG=3/4*S ABG=3/4*2/3*S ABC=1/2*S ABC
=>S BEGC=1/2*S ABC
AF=FG
=>AF=1/2*AG
=>S AEF=1/2*S AEG=1/2*1/2*S ABC=1/4*S ABC
AD=2DE
=>AD=2/3AE
=>S ADF=2/3*S AEF=2/3*1/4*S ABC=1/6*S ABC
=>s EDFG=S ABC(1/4-1/6)=1/12*S ABC
S BCGE-S DEFG=15cm2
=>S ABC(1/2-1/12)=15
=>SABC=15:5/12=36cm2
DT
15 tháng 9 2021
1. seeing
2. working
3. to meet
4. talking/ to finish
5. asking
6. not to speak
7. carrying
8. overhearing
9. writing/ waiting
10. to avoid/ being
11. giving/ to speak
12. going/ saying
13. to persuade/ to agree
14. sneezing/ sitting
15. driving/ being
16. to start/ looking
17. to show/ to use
18. making/ to do
19. remaining/ to help/ to stay
20. listening/ hearing
21. camping
22. to be
23. to speak
24. to pay
25. to meet
26. not trying/ to solve
27. being
28. hunting
29. to be
30. working
31. going
32. to do
33. to bring
34. working
35. to buy
36. to inform
37. studying
38. to buy
39. to be fed
40. working
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
11 tháng 8 2023
\(Bài.7:\\ a,\dfrac{\left(-3\right)^{10}.15^5}{25^3.\left(-9\right)^7}=\dfrac{3^{10}.3^5.5^5}{\left(5^2\right)^3.\left(3^2\right)^6.3.\left(-3\right)}\\ =\dfrac{3^{15}.5^5}{-5^6.3^{14}}=-\dfrac{3}{5}\\ b,2^3+3.\left(\dfrac{1}{9}\right)^0-2^{-2}.4+\left[\left(-2\right)^2:\dfrac{1}{2}\right].8\\ =8+3.1-\dfrac{1}{4}.4+\left[4:\dfrac{1}{2}\right].8\\ =8+3-1+8.8\\ =11-1+64=10+64=74\)
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
11 tháng 8 2023
Bài 10:
\(a,3^{35}=\left(3^7\right)^5=2187^5\\ 5^{20}=\left(5^4\right)^5=625^5\\ Vì:2187^5>625^5\left(Vì:2187>625\right)\\ \Rightarrow3^{35}>5^{20}\\ b,2^{32}=\left(2^4\right)^8=16^8\\ Vì:37^8>16^8\left(Do:37>16\right)\\ \Rightarrow37^8>2^{32}\)
14 tháng 12 2021
1 have just seen
2 have ever seen /isdefinitely
3 never use
4 has already seen
5 can probably get
Tờ 1
III
15 - a
16 - C
17 - D
18 - B
IV
19 are thrown
20 Have just bought
21 playing
22 written
V
23 They think their holidays arre wonderful.
24 The writer likes speding his holiday in the countryside.
25 Taking a leisurely bicycle trip to the countryside is the best way of recreation.
26 He feels healthier after his holidays in the countryside.
VI
27 Would you mind if I smoked here?
28 We have live here since 1995
29 I study English in order to talk to foreigners
30 The old school is used as a sports center
Tờ 2
II
1 B
2 D
3 A
4 C
5 A
6 B
7 B
8 B
9 B
10 B
III
1 - C
2 - D
3 - A
4 B