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12 tháng 4 2017

Thay x=1 vào pt, ta có: \(\left(a+1\right)\left(b+1\right)\left(c+1\right)=-5\left(1\right)\)

vì vai trò của a,b,c là như nhau, giả sử:\(a>b>c\Rightarrow a+1>b+1>c+1\left(2\right)\)

vì a,b,c là số nguyên nên a+1,b+1,c+1 cũng là số nguyên (3)

từ (1),(2),(3)\(\Rightarrow\hept{\begin{cases}a+1=5\\b+1=1\\c+1=-1\end{cases}\Leftrightarrow\hept{\begin{cases}a=4\\b=0\\c=-2\end{cases}}}\)

19 tháng 12 2016

Mọi người giải ra giúp ạ, cảm ơn nhiều!

3 tháng 3 2017

                  \(a+b+c=3\)

              So \(\frac{1}{a2}\)

16 tháng 3 2016

2: Ước của 120 là:

{1;2;3;4;5;6;8;10;12;15;20;24;30;40;60;120}

9: x+ (1+2+3+4+...+100) = 5750

    x + 5050= 5750

     x = 5750 - 5050 = 700

6. Chữ số thứ 215 là 1285

16 tháng 2 2017

cau 2 la co 16 uoc

cau 5 a=7 b=-1 c=-2 d=-3

20 tháng 12 2016

Ta có:

\(\hept{\begin{cases}ab=q\\a+b=p\end{cases}}\)và \(\hept{\begin{cases}cd=s\\c+d=r\end{cases}}\)

\(M=\frac{2\left(abc+bcd+cda+dab\right)}{p^2+q^2+r^2+s^2}=\frac{2\left(qc+sb+sa+qd\right)}{p^2+q^2+r^2+s^2}\)

\(=\frac{2\left(qr+sp\right)}{p^2+q^2+r^2+s^2}\le\frac{2\left(qr+sp\right)}{2\left(qr+sp\right)}=1\)

Với M = 1 thì \(\hept{\begin{cases}q=r\\p=s\end{cases}}\)

Tới đây thì không biết đi sao nữa :D

20 tháng 12 2016

thôi bỏ bài này đi cũng được vì chưa tới lúc cần dung phương trình

27 tháng 1 2016

mình ko bít tiếng anh bn dịch hộ mình đi

Lesson 1: analyzing the polynomial factors.Notes + 2 x-1x 3 + 6x2 + 11x + 6x 4 + 2 x 2-3AB + ac + b2 + 2bc + c2A3-b3 + c3 + 3abcLesson 2: for functions: search conditions of x to A means.A shortening.Computer x to A < 1.Post 3: prove the inequality:For a + b + c = 0. Prove that: a3 + b3 + c3 = 3abc.For a, b, c are the sidelengths of the triangle. Proof that:Prove that x 5 + y5 ≥ x4y + xy4 with x, y ≠ 0 and x + y ≥ 0Lesson 4: solve the equation:x 2-3 x + 2 + | x-1 | = 0Lesson 5: find the...
Đọc tiếp

Lesson 1: analyzing the polynomial factors.

Notes + 2 x-1
x 3 + 6x2 + 11x + 6
x 4 + 2 x 2-3
AB + ac + b2 + 2bc + c2
A3-b3 + c3 + 3abc
Lesson 2: for functions: 

search conditions of x to A means.
A shortening.
Computer x to A < 1.
Post 3: prove the inequality:

For a + b + c = 0. Prove that: a3 + b3 + c3 = 3abc.
For a, b, c are the sidelengths of the triangle. Proof that:


Prove that x 5 + y5 ≥ x4y + xy4 with x, y ≠ 0 and x + y ≥ 0
Lesson 4: solve the equation:

x 2-3 x + 2 + | x-1 | = 0


Lesson 5: find the largest and smallest value (if any)

A = x 2-2 x + 5
B =-2 x 2-4 x + 1.
C = 
Lesson 6: calculate the value of expression.

Know a – b = 7 feature: A = (a + 1) a2-b2 (b-1) + ab-3ab (a-b + 1)
For three numbers a, b, c is not zero catches up deals for equality: 
Computer: P = 

Article 7: proof that

8351634 + 8241142 divisible 26.
A = n3 + 6n2-19n-24 divisible by 6.
B = (10n-9n-1) divisible 27 with n in N *.
Article 8:

In the motorcycle race three cars depart at once. The second car in a one-hour run slower than the first car 15 km and 3 km third cars. rapidly should the destination more slowly the first car 12 minutes and the third car earlier today. No stops along the way. Calculate the speed of each car, race distance and the time each car

0
Complete the sentences 1. We are looking for ... place to spend ..... night. A. the/the B. a/the C. a/a D. the/a 2. Please turn off.... lights when you leave...... room. A. the/the B. a/a C. the/a D. a/the 3. We are looking for people with...... experience. A. the B. a C. an. D. x 4. Would you pass me.....satl, please? A. A B. the C. an D. x 5. Can you show me....way to.... staiton? A. the/the. B. a/a. C. the/a. D. a/the 6. She has read...... interesting book. A. a B. an C....
Đọc tiếp

Complete the sentences

1. We are looking for ... place to spend ..... night.

A. the/the B. a/the C. a/a D. the/a

2. Please turn off.... lights when you leave...... room.

A. the/the B. a/a C. the/a D. a/the

3. We are looking for people with...... experience.

A. the B. a C. an. D. x

4. Would you pass me.....satl, please?

A. A B. the C. an D. x

5. Can you show me....way to.... staiton?

A. the/the. B. a/a. C. the/a. D. a/the

6. She has read...... interesting book.

A. a B. an C. the D. x

7. You’ll get.....shock if you touch.....live wire with that screwdriver.

A. an/the B. the/an C. an/an D. The/the

8. Mr. Smith is..... old customer and .... honest man.

A. an/the B. the/an C. an/an D. the/the

9. .... youngest boy has just started going to ..... school.

A. a/x B. x/the C. an/x D. the/x

10. Do you go to .... prison to visit him?

A. the B. a C. x D. an

11. I will visit my grandma In ..... spring.

A. The. B. X. C. a. D. an

X ở đay có nghĩa là ko chọn đáp án nào cả nha mn, giúp mik nhé😘❤️

1
23 tháng 7 2018

Complete the sentences

1. We are looking for ... place to spend ..... night.

A. the/the B. a/the C. a/a D. the/a

2. Please turn off.... lights when you leave...... room.

A. the/the B. a/a C. the/a D. a/the

3. We are looking for people with...... experience.

A. the B. a C. an. D. x

4. Would you pass me.....satl, please?

A. A B. the C. an D. x

5. Can you show me....way to.... staiton?

A. the/the. B. a/a. C. the/a. D. a/the

6. She has read...... interesting book.

A. a B. an C. the D. x

7. You’ll get.....shock if you touch.....live wire with that screwdriver.

A. an/the B. the/an C. an/an D. The/the

8. Mr. Smith is..... old customer and .... honest man.

A. an/the B. the/an C. an/an D. the/the

9. .... youngest boy has just started going to ..... school.

A. a/x B. x/the C. an/x D. the/x

10. Do you go to .... prison to visit him?

A. the B. a C. x D. an

11. I will visit my grandma In ..... spring.

A. The. B. X. C. a. D. an

24 tháng 7 2018

Cảm ơn nhìu nak😘