,第 10 课时 练 习 课,78,70,8,44,40,75,5,70,93,3,90,4,方法一:50+3=53,5355,够 方法二:55-50=5,53,够,每人一瓶矿泉水,55瓶够吗?,有50个学生,3个老师。,2.,4.,50,72,60,26,95,70,9,8,30,76,4,80,56分,56-50=6(分),5,1,2,9,
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