Question

Va rog urgent dau Coroana

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

$\it f(x)=2,5(-2x+4)-4\\ \\ f(x)>0 \Rightarrow 2,5(-2x+4)-4>0|_{+4} \Rightarrow 2,5(-2x+4)>4 \Rightarrow \\ \\ \Rightarrow -5x+10>4 \Rightarrow 10-4>5x \Rightarrow 6>5x \Rightarrow 5x<6|_{\cdot2} \Rightarrow 10x<12|_{:{10}} \Rightarrow \\ \\ x<1,2 \Rightarrow x\in(-\infty;\ \ 1,2)$