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78一巩固练习708444075570933904
方法一:50+3=53,53<55,够方法二:55-50=5,5>3,够每人一瓶矿泉水,55瓶够吗?有50个学生,3个老师。2.一巩固练习
一巩固练习299-20页
4.507260269570983076480一巩固练习
一巩固练习840+48条
一巩固练习355-30根
56分56-50=6(分)一巩固练习
5303129708一巩固练习
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