Question

cine ma poate ajuta cu un model de Evaluare Nationala.

Answer 1

$\it 10)\\ \\ a= |\sqrt2-\sqrt3| = \sqrt3-\sqrt2 \\ \\ b= |\sqrt3+\sqrt2| = \sqrt3+\sqrt2 \\ \\ ab=(\sqrt3-\sqrt2)(\sqrt3+\sqrt2) =(\sqrt3)^2 -(\sqrt2)^2 =3-2=1 \\ \\ ----------------------- \\ \\ 11)\ \ R = 8:2 = 4\ cm$

$\it 12)\ \ \mathcal{A} = \dfrac{AB\cdot AC\cdot sinA}{2} =\dfrac{6\cdot10\cdot sin30^o}{2} = 3\cdot10\cdot\dfrac{1}{2} = 3\cdot5=15\ cm^2$