Special topic:
Analysis: (1) Let the purchase price of A be X yuan and the purchase price of B be Y yuan. It takes 300 yuan to buy five A-goods and four B-goods, and 440 yuan to build two equations and form equations to find their solutions.
(2) If you buy the product of A, you will buy the product of B (50-a). According to the profit of not less than 348 yuan, an inequality can be established and its solution can be found.
Solution: Solution: (1) Let the purchase price of type A be X yuan and that of type B be Y yuan.
5x+4y=300
6x+8y=440
Solution:
x=40
y=25
A: The purchase price of A is 40 yuan, and the purchase price of B is 25 yuan.
(2) If you buy one commodity A, you will buy (50-a) commodity B..
8a+6(50-a)≥348，
Solution: a≥24
Answer: Buy at least 24 products.