Question

急急急，帮我做两问也行，谢谢

Answer 1

1，橘迅销售收入=
xy=〈200-2x〉〈x+30〉
=-2x^2+140x+6000
x=15，
xy=(200-30)*45*0.8
=170x36=6120
成本=6120/册伍闷州弯(1+20%)=5100

追答

2， 利润=销售收入-成本
=-2x^2+140x+900
求导-4x+140=0，x=35天
-2x35^2+140x35+900
=-2450+5800=3400元

=-245o+5800=3350

1，销售收入=
xy=〈200-2x〉〈x+30〉
=-2x^2+140x+6000
x=15，
xy=(200-30)*45*0.8
=170x36=6120
成本=6120/(1+20%)=5100
5100/170=30元/件