题干

某商场销售一批名牌服装,平均每天可售出20件,每件盈利40元,为了增加盈利,商场决定采取适当的降价措施,经调查发现.如果每件服装每降低1元,商场平均每天可多售出2件.若商场平均每天要盈利1200元,问每件服装应降价多少元?

上一题 下一题 0.0难度 选择题 更新时间:2019-04-13 12:37:25

答案(点此获取答案解析)

解:设每件服装应降价10元,
根据题意可得:(20+2x)(40-x)=1200,
整理得:x2-30x+200=0,
解得:x1=20,x2=10,
根据实际应取x=10,
答:每件服装应降价10元.

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     【甲】晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂村,芳草鲜美,落英缤纷。渔人甚异之。复前行,欲穷其林。

      林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田美池桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。

      见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”

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     【乙】相命肆农耕①,日入从所憩。桑竹垂余荫,菽稷随时艺②。春蚕收长丝,秋熟靡王税③。路荒暖交通④,鸡犬互鸣吠。俎豆犹古法⑤,衣裳无新制。童孺纵歌行,斑白欢游诣。草荣识节和,木衰和风厉。虽无纪历志,四时自成岁,怡然有余乐,于何劳智慧?

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A

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B

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