{5-7x=>2x-4 {1-3/4(x-1)
问题描述:
{5-7x=>2x-4 {1-3/4(x-1)
答
5-7x≥2x-4
-7x-2x≥-4-5
-9x≥-9
x≤1
1-3/4(x-1)