一封信重300克,需要寄往外地,现只有80分和1.2元的邮票,要求最多贴3张邮票,请你根
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题意最多只能贴3枚邮票,而邮资需要10元,现有的是80分和1.2元,10-1.2-0.8=8元。
或者
10-0.8=9.2
10-0.8-0.8=8.4
10-1.2=8.8
10-1.2-1.2=7.6
10-0=10
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