MN ơi e cần gấp MN giúp e vs ĐỀ EM ĐỂ Ở DỨƠI CMT VÌ KO BT VIẾT
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MH
25 tháng 9 2021
1) \(\sqrt{2x-5}=7\)
\(\left(\sqrt{2x-5}\right)^2=7^2\)
\(2x-5=49\)
\(2x=54\)
\(x=27\)
2) \(3+\sqrt{x-2}=4\)
\(\sqrt{x-2}=1\)
\(\left(\sqrt{x-2}\right)^2=1^2\)
\(x-2=1\)
\(x=3\)
25 tháng 9 2021
1) \(\sqrt{2x-5}=7\left(đk:x\ge\dfrac{5}{2}\right)\)
\(\Leftrightarrow2x-5=49\Leftrightarrow2x=54\Leftrightarrow x=27\left(tm\right)\)
2) \(3+\sqrt{x-2}=4\left(đk:x\ge2\right)\)
\(\Leftrightarrow\sqrt{x-2}=1\Leftrightarrow x-2=1\Leftrightarrow x=3\)
3) \(\Leftrightarrow\sqrt{\left(x-1\right)^2}=1\Leftrightarrow\left|x-1\right|=1\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=1\\x-1=-1\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=0\end{matrix}\right.\)
4) \(\Leftrightarrow\sqrt{\left(x-2\right)^2}=1\Leftrightarrow\left|x-2\right|=1\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)
5) \(\Leftrightarrow\sqrt{\left(2x-1\right)^2}=\sqrt{\left(x+4\right)^2}\)
\(\Leftrightarrow\left|2x-1\right|=\left|x+4\right|\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-1=x+4\\2x-1=-x-4\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-1\end{matrix}\right.\)
6) \(ĐK:x\ge-2\)
\(\Leftrightarrow5\sqrt{x+2}-3\sqrt{x+2}-\sqrt{x+2}=\sqrt{x+7}\)
\(\Leftrightarrow\sqrt{x+2}=\sqrt{x+7}\)
\(\Leftrightarrow x+2=x+7\Leftrightarrow2=7\left(VLý\right)\)
Vậy \(S=\varnothing\)
7) \(ĐK:x\ge-1\)
\(\Leftrightarrow5\sqrt{2x+1}+3\sqrt{x+1}=4\sqrt{x+1}+4\sqrt{2x+1}\)
\(\Leftrightarrow\sqrt{2x+1}=\sqrt{x+1}\)
\(\Leftrightarrow2x+1=x+1\Leftrightarrow x=0\left(tm\right)\)
09
0
17 tháng 6 2023
9:
a: XétΔABC vuông tại A và ΔHBA vuông tại H có
góc B chung
=>ΔABC đồng dạng với ΔHBA
=>BA/BH=BC/BA
=>BA^2=BH*BC
b: BC=25cm; AB=căn 9*25=15cm; AC=căn 16*25=20cm
S ABC=1/2*15*20=150cm2
C ABC=25+15+20=60cm
mn ơi ai thấy bài này giúp em được ko ạ,e đang cần gấp lắm
30 tháng 10 2021
a, Vì D,M là trung điểm AB,AC nên DM là đtb tg ABC
Do đó \(DM=\dfrac{1}{2}BC=\dfrac{7}{2}\left(cm\right)\) và DM//BC
K
3 tháng 2 2021
8. The examiners have to read the passage 3 times.
The passage has to be read 3 times by the examiners
12.They will have to pull down that building.
That building will have to be pulled down
17. You should pay more attention to your study.
Your study should be paid more attention to
18.They can see the valley from the top of this hill.
The valley can be seen from the top of this hill
19.You must wash your hands.
Your hands must be washed
20. Will you post this letter on the way to work?
Will this letter be posted on the way to work by you?
22. How many ways can you solve this problem?
How many ways can this problem be solved?
23. I am sure that I will prepare everything carefully.
I'm sure that everything will be prepared carefully by me
28. she couldn’t catch his name.
His name couldn't be caught by her
31.Jane is going to buy a new computer.
A new computer is going to be bought by Jane
32. He is going to sell his house.
His house is going to be sold by him
33.Millions of people will visit the museum .
The museum will be visited by millions of people
35. Nothing will affect the result of the competition.
The result of the competition won't be affected
37. We will force the villagers to work hard
The villagers will be forced to work hard by us
38.They should ask him before giving the decision.
He should be asked before they give the decision
40. They have to cancel the meeting.
The meeting has to be cancelled
41. She needs to clean the floor.
The floor needs to be cleaned
V
violet
Giáo viên
3 tháng 2 2021
Chào em, em tham khảo nhé!
8. The examiners have to read the passage 3 times.
=> The passage has to be read 3 times by the examiners.
12.They will have to pull down that building.
=> That building will have to be pulled down.
17. You should pay more attention to your study.
=> Your study should be paid more attention to.
18.They can see the valley from the top of this hill.
=> The valley can be seen from the top of this hill.
19.You must wash your hands.
=> Your hands must be washed.
20. Will you post this letter on the way to work?
=> Will this letter be posted on the way to work?
22. How many ways can you solve this problem?
=> How many ways can this problem be solved?
23. I am sure that I will prepare everything carefully.
=> I am sure that everything will be prepared carefully.
28. She couldn’t catch his name.
=> His name couldn't be caught by her.
31.Jane is going to buy a new computer.
=> A new computer is going to be bought by Jane.
32. He is going to sell his house.
=> His house is going to be sold by him.
33.Millions of people will visit the museum.
=> The museum will be visited by millions of people.
35. Nothing will affect the result of the competition.
=> The result of the competition will not be affected (by anything).
37. We will force the villagers to work hard.
=> The villagers will be forced to work hard.
38.They should ask him before giving the decision.
=> He should be asked before giving the decision.
40. They have to cancel the meeting.
=> The meeting has to be cancelled.
41. She needs to clean the floor.
=> The floor needs cleaning/to be cleaned by her.
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