ail6478 2007-11-20 19:29
求助于数学题
有一批篮球,按制造质量分为一级品和二级品,二级品的进价比一级品便宜20%.按优质优价原则,一级品按20%的利润定价,二级品按15%的利润定价,一级品篮球比二级品篮球每个贵14元,问:一级品篮球的进价是每个多少元?.
ail6478 2007-11-20 19:38
x*20%-x*80%*15%=14
x=175.
红眉 2007-11-20 19:57
[quote]原帖由 [i]ail6478[/i] 于 2007-11-20 19:38 发表 [url=http://ww123.net/baby/redirect.php?goto=findpost&pid=2245568&ptid=4474310][img]http://ww123.net/baby/images/common/back.gif[/img][/url]
x*20%-x*80%*15%=14
x=175 [/quote]
x*(1+20%)-x*80%*(1+15%)=14
x=50.
duyan 2007-11-20 20:07
好像是:x/0.8-0.8x/0.85=14
x=45.33.
echooooo 2007-11-20 20:35
[quote]原帖由 [i]红眉[/i] 于 2007-11-20 19:57 发表 [url=http://ww123.net/baby/redirect.php?goto=findpost&pid=2245601&ptid=4474310][img]http://ww123.net/baby/images/common/back.gif[/img][/url]
x*(1+20%)-x*80%*(1+15%)=14
x=50 [/quote]
[em11].
羊鼠好妈妈 2007-11-20 22:20
[quote]原帖由 [i]红眉[/i] 于 2007-11-20 19:57 发表 [url=http://ww123.net/baby/redirect.php?goto=findpost&pid=2245601&ptid=4474310][img]http://ww123.net/baby/images/common/back.gif[/img][/url]
x*(1+20%)-x*80%*(1+15%)=14
x=50 [/quote][em11].
草原牧歌 2007-11-21 15:56
[quote]原帖由 [i]红眉[/i] 于 2007-11-20 19:57 发表 [url=http://ww123.net/baby/redirect.php?goto=findpost&pid=2245601&ptid=4474310][img]http://ww123.net/baby/images/common/back.gif[/img][/url]
x*(1+20%)-x*80%*(1+15%)=14
x=50 [/quote]
我同意.