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Students who cannot even do simple addition and subtraction 學生甚至不會做簡單的加法和減法。 Students who can not even do simple addition and subtraction 學生們甚至不能計算簡單的加減法。 Students who can not even do simple addition and subtraction 學生們甚至不能做簡單的加減運算。 Review on the research for addition and subtraction word problem solving 加減文字題解決研究概述 Addition and subtraction calculation , simple and interesting game 加減法運算,簡單而有趣的游戲。 The first two basic operations in mathematics are addition and subtraction 數學中兩個最基礎的運算是加和減。 Pressing return a couple more times will show an addition and subtraction 再按兩次回車將顯示加法和減法表達式: Addition and subtraction 加法和減法( The danger : students who can not even do simple addition and subtraction 很危險的是,一些學生甚至連簡單的加減法都不會做。 He ' s only three , but he can already do simple problem in addition and subtraction 他只有3歲,但他已能做簡單的加減法題目了。