Ai giúp em với
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Những câu hỏi liên quan
1 tháng 7 2023
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
BT
7
13 tháng 7 2021
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: \(\sqrt{2x-5}=\sqrt{x-1}\)
\(\Leftrightarrow2x-5=x-1\)
\(\Leftrightarrow2x-x=-1+5\)
\(\Leftrightarrow x=4\)
PN
23 tháng 8 2021
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
C
1
6 tháng 11 2021
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
DT
29 tháng 6 2023
Từ ghép thuần việt tương ứng với từ hán việt:
- Cao điểm: trọng điểm, đỉnh điểm.
- Khán giả: người xem, người nghe.
DD
29 tháng 6 2023
Cao điểm: cao (thuần Việt) + điểm (Hán Việt)
Khán giả: khán (thuần Việt) + giả (Hán Việt)
VV
3
6 tháng 2 2021
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.
6 tháng 2 2021
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.
M2
16
21 tháng 9 2021
mà tiện thể giúp tớ đc không ( x + 2 ) nhân ( y - 5 ) = -7
11 tháng 12 2021
a: Xét ΔBAD vuông tại A và ΔBED vuông tại E có
BD chung
\(\widehat{ABD}=\widehat{EBD}\)
Do đó: ΔBAD=ΔBED
đề như kiểu cho thiếu từ í
1 I think London is more expensive than New York
2 Health is more important than money
3 xem lại đề
4 Health care service in the city is better than in the countryside
5 Living in urban areas is more comfortable than living in rural areas
6 In the pasture, this area is richer than that area
7 Peter is better at Math than Tom
8 The cities are often more crowded than the countryside
9 Is this cake more delicious than that ?
10 Who can be more intelligent than Tom in his class ?