a. -1 < x+1/6 - x-2/2 < 1
Giải thích
a. −1<x+16−x−22<1⇔−1<x+16−3x−26<1⇔−6<x+1−3x+6<6⇔−6<−2x+7<6⇔−6−7<−2x<6−7⇔−13<−2x<−1⇔13>2x>1⇔12<x<132Vậy S=x12<x<132
a. −1<x+16−x−22<1⇔−1<x+16−3x−26<1⇔−6<x+1−3x+6<6⇔−6<−2x+7<6⇔−6−7<−2x<6−7⇔−13<−2x<−1⇔13>2x>1⇔12<x<132Vậy S=x12<x<132