[微積] 極值問題
成本 C == (10 x + 0.008 x^2) + (8 y + 0.009 y^2)
限制式 100 <= x <= 600,
400 <= y <= 1000,
x + y == 1000
試求最小成本C及此時的x,y
Ans: x=470.6 y=529.4 C=13235.3
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