学生们掌握了小数、百分数和分数。
The students had a grasp of decimals, percentages and fractions.
你先学习分数，然后，学习小数。
现在从1到10之间挑选两个数，包括小数和分数，然后随意进行加、减、乘、除运算。
T: Now pick two number between one and ten, including decimal numbers and fractions, then add, subtract, multiply or divide them as you like.
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