微积分the cost of producing x units of a commodity

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• 微积分the cost of producing x units of a commodity
• 多元函数微积分设f(u,v)为可微分足够次的函数,试按r的方幂将函数 F(r)=(1/2π)∫(0,2π) f(x+r*cost,y+r*sint)dt展开,准确到r^4的项
• The total cost (in dollars) of producing x coffee machines is C(x)=2200+30x−0.8x2.
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