(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
问题描述:
(1000x+1000x X 0.5%) - (5000+5000X0.5%)≥1000
答
1000x(1+0.5%)-5000x(1+0.5%)≥1000
x(1+0.5%)-5x(1+0.5%)≥1
-4.02x≥1
x≤-0.249