{25x+28(80-x)≥2090 25x+28(80-x)≤2098}的解集
问题描述:
{25x+28(80-x)≥2090 25x+28(80-x)≤2098}的解集
答
25x+28(80-x)≥2090
-3x≥-150
x ≤50
25x+28(80-x)≤2098
-3x≤-142
x≥142/3
142/3≤x≤50