1,一个西瓜,分成十块,吃掉了五块,吃掉的占总数比例是5比10,即十分之五.
2,全班30个同学都交上作业,及格人数是25个,不及格人数与及格人数的比例是5比25.
3,一人投篮,一共投五次,有三次投进篮框,投进球数与投的个数比是3比5.确定吗确定,例子太多了,你可以随便编
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