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Cho 2 số dương x,y thỏa mãn \(x+y\le1\)
Tìm GTNN của biểu thức
\(A=\frac{1}{x^2+y^2}+\frac{501}{xy}\)
Cho Parabol (P):y=x2,(d):y=\(\left(m-2\right)x+m-5\).
a)Tìm m để (P) và (d) tiếp xúc nhau.
b)Tìm m để (d) và (P) tại 2 điểm phân biệt có hoành độ x1,x2 thỏa mãn \(\dfrac{x_1-1}{x_2}+\dfrac{x_2-1}{x_1}=\dfrac{18}{5}\)
Rút gọn biểu thức:
\(Q=\left(\frac{x-\sqrt{x}+7}{x-4}+\frac{1}{\sqrt{x}-2}\right):\left(\frac{\sqrt{x}+2}{\sqrt{x}-2}-\frac{\sqrt{x}-2}{\sqrt{x}+2}-\frac{2\sqrt{x}}{x-4}\right)\)
A=\(\left(\dfrac{3\sqrt{x}+x}{x-25}+\dfrac{1}{\sqrt{x}+5}\right):\dfrac{\sqrt{x}+2}{\sqrt{x-5}}\)
a) Rút gọn A
b) tìm x để giá trị tuyệt đới của A =-A
a. 2x^2+3x-27
b. x^2(y-z)+y^2(z-x)+z^2(x-y)
cho (P) y=x2 và đường thẳng (d) y=2(m+1)x-m2+4m -5. xác định m để (d) cắt (P) tại 2 điểm phân biệt nàm về bên phả trục tung
mong các bạn giúp mình. thanks
Cho hai số, y thỏa mãn: x+y=3 và x^2+y^2=5. Tính giá trị biểu thức: M=x^3+y^3
H24
22 tháng 1 2021 lúc 15:06
1. The accident took place just after the workers started their work. (HARDLY)
=> ....................
2. In the end, I felt i had been right to leave the club. (REGRETS)
=> .................
Tớ rất biết ơn bạn nào giúp ta làm các bài sau. Bài 1: Verb-form:1. That dead tree is very dangerous. I (have) it (cut) down tomorrow.2. It (snow) for three days now. The roads (block) if it doesnt stop soon.Bài 2: The articles a, an, the, zero articles1. Did you come by ___ air? - No. I came by ___ sea.2. Were going to ___tea with Smith today. Shall we take ___ car?3. He got ___ job in ___ south and spent ___ next two years doing ___ work he really enjoyed.4. It was ___ windy morning but they...
Đọc tiếp
Tớ rất biết ơn bạn nào giúp ta làm các bài sau. 
Bài 1: Verb-form:
1. That dead tree is very dangerous. I (have) it (cut) down tomorrow.
2. It (snow) for three days now. The roads (block) if it doesn't stop soon.
Bài 2: The articles a, an, the, zero articles
1. Did you come by ___ air? - No. I came by ___ sea.
2. We're going to ___tea with Smith today. Shall we take ___ car?
3. He got ___ job in ___ south and spent ___ next two years doing ___ work he really enjoyed.
4. It was ___ windy morning but they hired ___ boat and went for ___ sailing along ___ cost.
5. My mother goes to ___ church in ___ morning and in ___ afternoon goes to visit ___ friends
6. ___ postman's little boy says that he'd rather be ___ dentist than ___ doctor because ___ dentists don't get called out at ___ night.
Bài 3: Sentence-building:
1. There /be /detective movie /show /local cinema /Sunday.
2. This evening /she /going /listen /radio /maybe /read /book.
3.In /past /no one /go home/ until/ TV station/ close/ night.
4. Why/ daughter/ not like/ programs/ teenagers?
5. It/ possible/ choose/ from/ wide variety/ programs.
6. You/ enjoy/ watch/ programs/ children/ other/ country?
7. Tom/ prefer/ play soccer/ watch/ soccer matches/ TV.
8. She/ often spend/ spare time/ read books/ own room.
Bài 4: Choose the bes answer
1. I had ___ little time to go the shops
A. too B. so C. such D. enough
2. The woman ___ cat belongs to has gone away for a week.
A. which B. this C. whose D. 0
Bài 5: Complete the sentences with the correct time expression below.
1. They've ___ been interested in music and often attend concert.
2. It's very annoying! Jane is ___ forgetting where she's pyt things
3. Susan's parents ___ go out in the evenings because they finished work very late
4. I've only been taking karate classes ____ a few weeks but I'm already quite good.
5. Have you seen Tom ___ his party last week?