ai giúp em với
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a: 12h: 0 độ
10h: 60 đọ
6h: 180 độ
5h: 150 độ
b:
a: góc nhọn: góc yMz; góc tMz
b: góc vuông: góc yMt, góc xMt
c: góc tù: góc xMz
d: góc bẹt: góc xMy
1) Ta có: \(\sqrt{2x+5}=\sqrt{3-x}\)
\(\Leftrightarrow2x+5=3-x\)
\(\Leftrightarrow2x+x=3-5\)
\(\Leftrightarrow3x=-2\)
hay \(x=-\dfrac{2}{3}\)
2) Ta có: \(\sqrt{2x-5}=\sqrt{x-1}\)
\(\Leftrightarrow2x-5=x-1\)
\(\Leftrightarrow2x-x=-1+5\)
\(\Leftrightarrow x=4\)
3 , \(PT\left(đk:\frac{16}{3}\ge x\ge3\right)< =>x^2-3x=16-3x\)
\(< =>x^2-16=0< =>\left(x-4\right)\left(x+4\right)=0< =>\orbr{\begin{cases}x=4\left(tm\right)\\x=-4\left(ktm\right)\end{cases}}\)
4 , \(PT\left(đk:...\right)< =>2x^2-3=4x-3< =>2x^2-4x=0\)
\(< =>2x\left(x-2\right)=0< =>\orbr{\begin{cases}x=0\left(...\right)\\x=2\left(...\right)\end{cases}}\)
bạn tự tìm đk rồi đối chiếu nhé :P
SADM= \(\text{ }\dfrac{\text{1}}{\text{2}}\).AD.DM = \(\dfrac{\text{1}}{\text{2}}\) .8.12 = 48cm2
SADC = \(\dfrac{\text{1}}{\text{2}}\).AD.DC= \(\dfrac{\text{1}}{\text{2}}\) . 8.(12+5)= 68cm2
SABCD = \(\dfrac{\text{1}}{\text{2}}\).AD.(AB+CD)=\(\dfrac{\text{1}}{\text{2}}\).8.(12+12+5)=116cm2
SAMC = SADC-SADM = 68-48=20cm2
Vậy diện tích tam giác ABCD lớn hơn diện tích tam giác AMC 116-20=96 cm2
Từ ghép thuần việt tương ứng với từ hán việt:
- Cao điểm: trọng điểm, đỉnh điểm.
- Khán giả: người xem, người nghe.
Cao điểm: cao (thuần Việt) + điểm (Hán Việt)
Khán giả: khán (thuần Việt) + giả (Hán Việt)
1. There’s the lady. Her dog was killed.
There’s the lady whose dog was killed.
2. That’s the man. He’s going to buy the company.
That’s the man who is going to buy the company
3. He’s the person. His car was stolen.
He’s the person whose car was stolen
4. She’s the new doctor.The doctor’s coming to the hospital next week.
She's the new doctor who is coming to the hospital next week
5. She’s the journalist. Her article was on the front page of The Times.
She's the journalist whose article was on the front page of The Times.
6. They’re the people. Their shop burned down last week.
They’re the people whose shop burned down last week
7. That’s the boy. He’s just got a place at university.
That’s the boy who has just got a place at university.
1. This is the man I met in Paris.
2. I wanted the painting you bought.
3. This is the chair my parents gave to me
4. She’s the woman who telephoned the police.
5. He’s the person who wanted to buy your house.
6. We threw out the computer which never worked properly.
7. This is the lion being ill recently.
8. The man driving the car was badly injured.
9. The children living in the next street broke the window.
10. That’s the woman I was telling you about.
mà tiện thể giúp tớ đc không ( x + 2 ) nhân ( y - 5 ) = -7
a: Xét ΔBAD vuông tại A và ΔBED vuông tại E có
BD chung
\(\widehat{ABD}=\widehat{EBD}\)
Do đó: ΔBAD=ΔBED
Tham khảo
1. a - a - the - the
2. the
3. a
4. the
5. the
6. an
7. the
8. the
9. a
10. the
11. the
12. the
13. a
14. the - the
15. a - an - the
16. the
17. a - a - the
18. the -the
19. a
20. a - a - the
21 x
22. the
23. a
24. the/the
25. x
26. a/x
27. a
28. the
29. x
30. The/the
31. X
32. a
33. the - the
34. an - the
35. the
36 a
37 x - x
38 the
39 X - X
40 The