e. 5x^2 - 3. 5 + 3x -1/4 < x(2x + 3)/2 - 5
Giải thích
e. 5x2−35+3x−14<x2x+32−5
⇔4.5x2−3+53x−120<10x.2x+3−5.2020⇔20x2−12+15x−520<20x2+30x−10020⇔20x2+15x−17<20x2+30x−100⇔−15x<−83⇔15x>83⇔x>8315
Vậy S=xx>8315
e. 5x2−35+3x−14<x2x+32−5
⇔4.5x2−3+53x−120<10x.2x+3−5.2020⇔20x2−12+15x−520<20x2+30x−10020⇔20x2+15x−17<20x2+30x−100⇔−15x<−83⇔15x>83⇔x>8315
Vậy S=xx>8315