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今天,石屏小学五年级(1)班的数学课外作业中有这样一道题:某电信规定的市内通信费用计费标准是:前3分钟共计费0.3元,以后每分钟计费0.15元(不足一分钟的按一分钟收费)。在市区内,小红给小伟打了22分钟21秒的电话,小红应付费多少元?张丽看过这道比较复杂的问题,不知从哪里下手,她就去问对门的同班同学缪东。缪东正在和爸爸下棋,见张丽来问题目,就暂停下棋。缪东听过张丽说的题目,说:“刚才我已经把这道题做完,我是这
Today, the fifth-grade primary school (1) Shibing math extracurricular homework has such a problem: a telecommunications billing requirements for the city’s communications costs are: the first 3 minutes total cost of 0.3 yuan, after the billing of 0.15 yuan per minute (Less than a minute for a minute). In the urban area, Xiao Hong played 22 minutes and 21 seconds to Xiao Wei’s phone, how much does Xiao Hong pay? Zhang Li saw this complicated issue, I do not know where to start, and she went to ask her classmate Miao Dong. Miao Dong is playing chess with her father, see Zhang Li to ask questions, to stop playing chess. Miao Dong heard Zhang Li said the subject, said: ”I just finished this problem, I am this