... two-digit inflation 两位数通货膨胀 Two-digit Addition 两位数加法 Checking Two-Digit Subtraction 两位数减法的检验 ...
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... 交换加数和被加数来检验 (Checking Addition by Changing the Order ofAddends) 两位数加法 ( Adding Numbers with Two Digits ) 十和一 (Tens and Ones) 等式运算 (Working with Equations) 在大于和小于式中空缺的数 (Missing Number Problems with Greate...
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两位数的加法 Two-digit Addition
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