题干

2013年4月20日8时2分在四川省雅安市芦山县发生7.0级地震,有1.8万人等待安置,各地人民纷纷捐款灾区.某市一企业在得知灾区急需帐篷后立即与厂家联系购买帐篷送往灾区.已知用9万元刚好可以从厂家购进帐篷500顶.该厂家生产三种不同规格的帐篷,出厂价分别为甲种帐篷每顶150元,乙种帐篷每顶210元,丙种帐篷每顶250元.

①若企业同时购进其中两种不同规格的帐篷,则企业的购买方案有哪几种?

②若企业想同时购进三种不同规格的帐篷,必须每种帐篷都有,为了便于分类打包,每种帐篷数都要求是10的倍数.请你研究一下是否可行?如果可行请给出符合条件的设计方案;若不可行,请说明理由.

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答案(点此获取答案解析)

解:设购买的帐篷数为甲种x顶,乙种y顶,丙种z顶,

①由题意分三种情况讨论:

(i)x+y=500150x

同类题1

阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。

A Language Programme for Teenagers

Welcome to Teenagers Abroad! We invite you to join us on an amazing journey of language learning.

Our Courses

Regardless of your choice of course, you'll develop your language ability both quickly and effectively.

Our Standard Course guarantees a significant increase in your confidence in a foreign language, with focused teaching in all 4 skill areas----speaking, listening, reading and writing.

Our Intensive Course builds on our Standard Course, with 10 additional lessons per week, guaranteeing the fastest possible language learning (see table below).

Course Type

Days

Number of Lesson

 Course Timetable

Standard Course

Mon-Fri

20 lessons

9:30-12:30

Intensive Course

Mon-Fri

20 lessons

9:30-12:30

20 lessons

13:30-14:30

Evaluation

Student are placed into classes according to their current language skills. The majority of them take on online language test before starting their programme. However, if this is not available, students sit the exam on the first Monday of their course.

Learning materials are provided to students throughout their course, and there will never be more than 15 participants in each class.

Arrivals and Transfer

Our programme offers the full package—students are take good care of from the start through to the very end. They are collected from the airport upon arrival and brought to their accommodation in comfort. Werequire the student's full details at least 4 weeks in advance.

Meals/Allergies(过敏)/Special Dietary Requirements

Students are provided with breakfast, dinner and either a cooked or packed lunch (which consists of a sandwich, a drink and adessert). Snacks outside of meal times may be purchased by the student individually.

We ask that you let us know of any allergies or dietary requirements as well as information about any medicines you take. Depending on the type of allergies and/ or dietary requirements, an extra charge may be made for providing special food.