求 初一不等式题与应用题(必附答案)越多越好 急!
推荐回答(1个)
1.某宾馆底层客房比二楼少2间,某旅游团有45人要求住宿,若全安排底层,每间住3人房间不够,每间住4人有房间没注满,又若全安排在二楼,每间住2人房间不够,每间住3人有房间没注满,问该宾馆底层有客房多少间????
设一楼有房间X个,则二楼有房间X+2个,根据题意得:
X<45/3,
X>=45/4
45/2>X+2
3(X+2)>45
得到 13如果底层是12,那二楼是14,不对
如果底层是13,那二楼是15,不对
如果底层是14,那二楼是16,OK.
该宾馆的客房是14+16=30间.
2.小明和小亮共下了10盘围棋,小明胜一盘记1分,小亮胜一盘记3分,当他们下完第9盘后,小明的得分高于小亮;等下完第10盘后,小亮的得分高于小明,他们各胜过几盘?
设;小明胜了X盘,小亮胜了X-10盘
X-3(10—X )<0
X-3(10—X )+3>0
解得27/4<X<30/4
因为X为整数
所以X=7
答;小明胜了7盘,小亮胜了3盘
3.小明放学回家,问爸爸妈妈小牛队与太阳队的比赛结果。爸爸:本场比赛太阳队的纳什比小牛队的特里多得了12分。妈妈:特里得分的2倍比纳什得分的差大于10,纳什得分的2倍比特里得分的3倍还多。爸爸又说:如果特里得分超过20分,则小牛队赢,否则太阳队赢。请你帮小明分析一下,究竟是哪个队赢了,本场比赛特里,纳什各得了多少分???
分析:通过认真读取题中信息,设特里得x分,则纳什得(x+12)分。此题满足两个不等关系:①2×特里得分-纳什得分>10;②2×纳什得分>3×特里得分。从而列出不等式组,确定出特里与纳什得分即可解决。
解:设特里得x分,则纳什得(x+12)分。由题意得解得22<x<24
因为 x取整数, 所以 x=23>20,所以小牛队赢了。
此时纳什得分 x+12=23+12=35(分)
答:本场比赛小牛队赢了,特里得了23分,纳什得了35分。
4.某公司经过市场调查.甲产品每件产品的产值为45万元.乙产品每件产品的产值为75万元.要求这两种产品全年共新增产量20件.这20件的总产值P(万元)满足:1100<P<1200.那么该公司明天应怎么安排甲.乙两种产品的生产量
设甲增产x件.乙就增产20-x件
1100<45x+75(20-x)<1200
即1100<1500-30x<1200
即300<30x<400
即10<x<40/3
由于x为正整数.所以x可以取11.12.13
这时候乙生产9.8.7件
5.某公司经过市场调查.甲产品每件产品的产值为45万元.乙产品每件产品的产值为75万元.要求这两种产品全年共新增产量20件.这20件的总产值P(万元)满足:1100<P<1200.那么该公司明天应怎么安排甲.乙两种产品的生产量
设甲增产x件.乙就增产20-x件
1100<45x+75(20-x)<1200
即1100<1500-30x<1200
即300<30x<400
即10<x<40/3
由于x为正整数.所以x可以取11.12.13
这时候乙生产9.8.7件
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