某纸厂为制作甲、乙两种无盖的长方形小盒,利用边角料裁出正方形和长方形两种废纸片.长方形的宽与正方形的边相等,现将150张

关于兴建造纸厂
一家英国公司想在我市建一个造纸厂,但是,关于这个问题,众说纷纭.一些人同意建这个造纸厂.如果建了工厂,将会有许多新工作提供给当地人,这定将推动城市经济的发展.还有,工厂能带来现代管理理念和新机器,包括环境保护的设备.
另一方面,另一些人坚持要求造纸厂不要建在城市里,他们最担心污染问题.他们认为工厂会制造噪声,打扰居民平静的生活.而且,从工厂排出的有害气体将污染我们呼吸的空气,河水也将会被工厂排出的污水所污染.
On Building a Paper Factory
A British company wants to build a paper factory in our city. But opinions are different on that issue. Some agree that we should build the paper factory. If we do so, many new jobs can be created tbr local people, which will surely push the development of the city‘s economy. What‘ s more, the factory will bring in modern ideas of management and new machines, including equipment for protecting the environment.
On the other hand, others insist on not having it built in the city, They are worrying about the pollution most. They believe that the factory will produce noises which will disturb people‘ s peaceful life. Besides, poisonous gas from the thctory will dirty the air we breathe. The river will also be polluted by the waste water from the factory.

设可以制作甲种长方体小盒x只,乙种长方体小盒数y只,
依题意
x+2y=150------(1)
4x+3y=300---(2)
由(1)得:
x=150-2y-----------(3)
把(3)代入(2)得:4(150-2y)+3y=300
-5y=-300
y=60
把y=60代入(1)得:x=30
x=30
y=60

桶的底面半径 180/2＝90cm
设生产x个1000张
90² *3.141*180*（1－15%）＝（320*240*20.）x
3892641.3=1536000x
x=3892641.3÷1536000≈2.5343
2.5243×1000＝2534张

x*（1+20%）万元

一般吨纸在0.1kg到1.2kg,浓度一般在百分之几

上个月那一场令人震惊的火灾使那间纸厂变成废墟.据报道,那间纸厂成千上万的纸箱到处乱放,好像是没有用了似的.终于在一个晚上,一些纸箱在一个角落里起火.五个员工被困其中,虽然消防队员立即赶到现场进行救援,还是有两个人葬身火海,另外三个严重受灾.last month,the shocking fire brought the paper factory in ruins.It is reported that thousands of the cartons were piled up everywhere and it seemed as if they were useless.Finally,some of the cartons bursted into fire in one corner one night,and five workers were trapped.Although the firemen rushed to the scene to rescue them right away,two were still burnt to dead and the other three got injured badly.