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設該商品日銷售金額為h(t),則 h(t)=f(t)*g(t) =(t+8)*(-t+40) =-t^2+32t+320 =-(t^2-32t)+320 =-(t-16)^2+256+320 =-(t-16)^2+576 所以當t=16時,h(t)有最大值,最大值為576
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