Test and analysis: (1) The unit price of learning machine is X yuan, and the unit price of schoolbag is Y yuan. According to "the sum of the unit price of English learning machine and schoolbag is 452 yuan" and "the unit price of English learning machine is 4 times less than that of schoolbag by 8 yuan", the equations are solved.
(2) Calculate the cost of the two supermarkets according to the meaning of the question, and then compare and choose.
(1) The unit price of the learning machine is X yuan, and the unit price of the schoolbag is Y yuan, which is deduced from the meaning in the question.
, solution
A: The unit price of this student's favorite English learning machine is 360 yuan, and the unit price of schoolbag is 92 yuan.
(2) Buying an English learning machine and a schoolbag in Supermarket A costs (360+92)× =339.
In supermarket B, you can buy an English learning machine in 360 yuan with cash, and then buy a schoolbag with 90 yuan shopping vouchers and 2 yuan cash. The total cash cost is 360+2=362.
Both 339 and 362 are less than 400, but 339 is less than 362, so it is cheaper to buy English learning machines and schoolbags in supermarket A.
Comments: The key to solving a problem is to understand the meaning of the problem, find out the appropriate equivalence relationship according to the conditions given by the problem, list the equations, and then solve them.