{5x-2>3(x+1),1/2x-2≤7-5/2x; {4(x-3)-5x≤-18,(2x-3)/3-(x+1)/2

题目

{5x-2>3(x+1),1/2x-2≤7-5/2x; {4(x-3)-5x≤-18,(2x-3)/3-(x+1)/2

答案

（1）5x-2>3(x+1) → 5x-2>3x＋3 → 2x>5 → x>5／2 1/2x-2≤7-5/2x → 1/2x＋5/2x≤9 → 3x≤9 → x≤3 所以5／2＜x...