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将一枚10元硬币及一枚20元硬币投入邮票销售机,它就会吐出一联面值共30元的邮票。为了更加便民,邮局决定举办一项竞赛,参赛者必须设计出一联不同面值的邮票,使之能组合出1到30元内任意数额的邮资。
Put a 10-yuan coin and a 20-yuan coin into the stamp vending machine, it will spit out a stamp with a par value of 30 yuan. In order to be more convenient, the Post Office has decided to hold a competition. Contestants must design a joint stamp of different denominations so that they can combine any amount of postage between $ 1 and $ 30.