Question

Poate cineva? Multumesc

Answer 1

$4)\frac{8}{x} :( \frac{3x+7}{3x} - \frac{ x^{2}+x }{ x^{2} } ) \\ = \frac{8}{x}: ( \frac{3 x^{2} +7x -3x^{2}-3x }{3 x^{2} }) \\ = \frac{8}{x} :\frac{ 4x}{3 x^{2} } \\ = \frac{8}{x} \frac{3 x^{2} }{4x} \\ = \frac{24 x^{2} }{4 x^{2} } \\ =6$
5)
a) f(x)=3x-2
f(5)=15-2=13
f(7)=21-2=19
Ma=$\frac{13+19}{2} = \frac{32}{2} =16$