Sharing your mathematics in MathYouLike

24/11/2017 at 20:47

Xác định $a, b$ để đồ thị của hàm số $y = a x + b$ đi qua các điểm.

a) $A (0; 3)$ và $B = (\frac{3}{5}; 0)$ ;

b) $A (1; 2)$ và $B (2; 1)$ ;

c) $A (15; - 3)$ và $B (21; - 3)$

12/01/2018 at 12:47

Prove that in every triangle we always have :

$60< \dfrac{aA+bB+cC}{a+b+c}< 90$ where A, B, C are the angles of triangle and a, b, c are edges opposite to that angle .

12/01/2018 at 12:49

Prove that n is the natural number we always have :

$\dfrac{1}{5}+\dfrac{1}{13}+\dfrac{1}{25}+...+\dfrac{1}{n^2+\left(n+1\right)^2}< \dfrac{1}{2}$

12/01/2018 at 19:26

Find x is a integer for A=x³+9x²+23x+15 $⋮$16

12/01/2018 at 21:15

13/01/2018 at 21:31

Polynomial analysis into multiplication and find x :

$x^3-x^2+x-1=0$

$x\left(x^2-16\right)-2\left(x^2-16\right)=0$