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1993年全国各地中考数学试题中不乏新型试题。浙江省宁波市是义务教育新教材试教区,该市“高中招生统一考试数学试题”中最后一题,就是一道妙题。 A市和B市分别有库存某种机器12台和6台,现决定支援给c市10台,D市8台,已知从A市调运一台机器到c市、D市的运费分别为400元和800元;从B市调运一台机器到c市、D市的运费分别为300元和500元。 (1)设B市运往C市机器x台,求总运费W关于x的函数关系式;
In 1993, there were no shortages of new test questions in the mathematics examinations in the national examinations. Ningbo, Zhejiang Province is the new teaching material area for compulsory education. The last question in the “Mathematics Test for Unified Examination of High School Enrollment” is a puzzle. A city and B city have stocks of 12 machines and 6 machines respectively. Now it is decided to support 10 cities in C and 8 cities in D. It is known that the freight rates for transporting one machine from city A to city C and city D are respectively 400 yuan and 800 yuan; the freight from B city to a machine to c city, D city is 300 yuan and 500 yuan respectively. (1) Let B city be transported to the C-city machine x station, and find the total freight W function relation on x;