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Anonymous users2024-01-23A furniture market sells tables and chairs at 300 yuan and 60 yuan per unit, respectively. 1) Buy a table and get two chairs as a gift; (2) Payment based on the total price. A customer needs to buy 5 tables and a number of chairs (no less than 10), if the number of purchases is known to be x (sets) and the payment number is y (yuan), try to express y in the algebraic form of x respectively on the two preferential methods, and discuss which of the two methods is more cost-effective when the customer buys the same chair?
with a one-dimensional inequality).
Solution, let's say you need to buy x (x 10) chairs, and the total number of dollars you need to spend is y for the first plan:
y=300x5+60×（x-10）=1500+60x-600=900+60x
The second option:
y=（300x5+60x）×
If the two options cost the same amount.
900+60x=
x=55When buying 55 chairs, both options cost the same amount of money.
When it is more than 55, choose the second option.
When there are less than 55 pieces, choose the first option.
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320/(1－1/6）
What material to look at, the picture is not clear, it is not clear.