... experimental fact 实验事实 ; 实殓事实 Fact family 加减法的几组基本性质 ; 加减法的几组基天性质 basic fact 基本事实 ; 基础事实 ...
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...d Halves)和数位10的加法(Sum of 10)加法和减法的检验(Checking Addition and Subtraction)加减法的几组基本性质(Fact Families)添出等式中空缺的数(Find the Missing Number)在大于和小于式中空缺的数(Missing Number Problems with Greater Than and Less T...
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