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4 tháng 12 2017

Call the smallest digit a => 3-digit number a, 2a, 3a with 3a ≤ 9 => a ≤ 3. Find the number divisible by 18, which is divisible by 9, so (a + 2a + 3a) = 6a is divisible by 9 => a is divisible by 3, so a = 3 => 3 digits are 3, 6, 9
The number to find is even by dividing by 2, so the last digit is 6
=> 396 or 936

4 tháng 12 2017

Call the smallest digit a => 3-digit number a, 2a, 3a with 3a ≤ 9 => a ≤ 3. Find the number divisible by 18, which is divisible by 9, so (a + 2a + 3a) = 6a is divisible by 9 => a is divisible by 3, so a = 3 => 3 digits are 3, 6, 9
The number to find is even by dividing by 2, so the last digit is 6
=> 396 or 936

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
26 tháng 12 2016

the length of the diagonal is 26 centimeters

k cho mình nha cảm ơn

14 tháng 12 2016

\(x^2-1=\left(x+1\right)\left(x-1\right)\)

\(f\left(x\right)=x^4+ax^3+bf\left(x\right)=x^4+ax^3+b\)

Theo định lí Bezout, ta có :

\(f\left(1\right)=1+ax^3+b=0=>a+b=-1\)

\(f\left(-1\right)=1-a+b=0=>-a+b=-1\)

Giải hệ phương trình, ta có:

a+b=-1

-a+b=-1

=> a=0;b=-1

=>a+b=-1

22 tháng 1 2018

Luân Đào