Question

Sper sa se vada.....va rog.....dau tezaa....

Answer 1

1.

$E(x)=x^3(x+7):x^2-x^2=x(x+7)-x^2=x^2+7x-x^2=7x$

2.

$P=\frac{Nr \ cazuri \ favorabile}{Nr \ cazuri \ posibile}$

$Nr \ cazuri \ favorabile : 2,4,6 = 3$

$Nr \ cazuri \ posibile : 1,2,3,4,5,6 = 6$

$P=\frac{3}{6} =\frac{1}{2}$

3.

$(x+x)*x^6=2x*x^6=2x^7$

4.

$x^2-3=0$

$x^2=3$

$x= \pm \sqrt{3}$

5.

$xOy \ \ \ \ \ O(0,0) \ A(1,-2)$

$OA=\sqrt{(x_a-x_o)^2+(y_a-y_o)^2} =\sqrt{(1-0)^2+(-2-0)^2}=\sqrt{1+4}$=\sqrt{5}