特别急!谢谢!
1个回答
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(1). y = (50+4X)*(100-0.8X)
x=10
=> y = (50+4*8)*(100-0.8*10)
= 82 * 92
= 7544
销量 82 件 销售为7544元
(2). 920 = (50+4X)*(20-0.8X) -200
=> 1120 = 1000 +80X -40X - 3.2X^2
=> 3.2X^2-40X + 120 =0
=> x=5 or 7.5
=> 50+4X = 70 or 80 件
the ends
x=10
=> y = (50+4*8)*(100-0.8*10)
= 82 * 92
= 7544
销量 82 件 销售为7544元
(2). 920 = (50+4X)*(20-0.8X) -200
=> 1120 = 1000 +80X -40X - 3.2X^2
=> 3.2X^2-40X + 120 =0
=> x=5 or 7.5
=> 50+4X = 70 or 80 件
the ends
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