Test site: the application of one-dimensional linear inequality
Special topic: Scheme type.
Analysis: Let B and C rent A and B respectively. Then, according to two cases: type A rent 1 or two cars, the equations are discussed.
Solution: Solution: Let's assume two kinds of cars, B and C, and rent A and B respectively.
① When Type A rents 1 car, there are
30a+ 10b= 150-50,
3a+b= 10。
A and b are integers,
Then a= 1, b=7 or a=2, b=4 or a=3, b = 1.
(2) When Type A rents 2 cars, there are
30a+ 10b= 150-50×2,
3a+b=5。
A and b are integers,
Then a= 1 and b = 2.
To sum up, there are four kinds of * * *.
So choose B.
Comments: First of all, this question should consider two cases of model A. 。
Can list the binary linear equation according to the meaning of the question, and then analyze it according to the fact that the number of cars is an integer.
I wish the landlord unlimited money and everything is awesome!