不等式应用
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不等式应用
由题意得:(20-5/2t)* 24000 * t% ≥9000
(20-5t/2)*24000*t/100≥9000
(20-5t/2)*240t≥9000
(20-5t/2)*t≥75/2
(40-5t)*t≥75
40t-5t^2≥75
t^2-8t+15≤0
(t-3)(t-5)≤0
解得:3≤t≤5
不等式应用
由题意得:(20-5/2t)* 24000 * t% ≥9000
(20-5t/2)*24000*t/100≥9000
(20-5t/2)*240t≥9000
(20-5t/2)*t≥75/2
(40-5t)*t≥75
40t-5t^2≥75
t^2-8t+15≤0
(t-3)(t-5)≤0
解得:3≤t≤5