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Math problem n?
Test sites: the application of one-dimensional linear inequality and the application of binary linear equations.

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.