-2x^2+7x-5>0Споситеее
-2x²+7x-5>0
D=49-4*2*5=9
x1=(-7+3)/-4;x2=(-7-3)/-4;
x=1; x=2,5;
- + -
_____1______2,5______
x ∈ (1;2,5)