要列式，步驟，不用答案。?
回答 (1)
2015-08-25 6:13 am
✔ 最佳答案
26.Let $y the original price at both the two shops.
The price at Shop A after a week
= $y × ( 1 ‒ 30%) × (1 + 30%)
= ......
The price at Shop B after a week
= $y × ( 1 ‒ 40%) × (1 + 40%)
= ......
The prices at the two shops (are / are NOT) the same after a week.
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