2*10+2.5(x-10)≥25
问题描述:
2*10+2.5(x-10)≥25
答
20+2.5x-25>=25
2.5x>=30
∴x>=12
2*10+2.5(x-10)≥25
20+2.5x-25>=25
2.5x>=30
∴x>=12