5×2×(10-x)+0.8×4x≥14.4 x最后得多少?

问题描述:

5×2×(10-x)+0.8×4x≥14.4 x最后得多少?
急!

5×2×(10-x)+0.8×4x≥14.4 x最后得多少?
解,得:
100-10x+3.2x-14.4x>=0
21.2x>=100
x>=500/101