c. x+1/2019 + x+2/2018 + x+3/2017 + ... + x+100/1920 > -100
Giải thích
c)x+12019+x+22018+x+32017+...+x+1001920>−100⇔x+20202019+x+20202018+...+x+20201920>0⇔x+202012019+12018+...+11920>0⇔x+2020>0⇔x>−2020
Vậy x > -2020
c)x+12019+x+22018+x+32017+...+x+1001920>−100⇔x+20202019+x+20202018+...+x+20201920>0⇔x+202012019+12018+...+11920>0⇔x+2020>0⇔x>−2020
Vậy x > -2020