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We do addition and subtraction in arithmetic. 在算术里，我们作加减运算。
My father taught me to do addition and subtraction. 我爸爸教我加减法。
When we do addition and subtraction of decimals, we should cross out the 0 at the end. 根据小数的性质：小数末尾的0去掉，小数的大小不变。
We do addition and subtraction in arithmetic 在算术里，我们作加减运算。
Students who cannot even do simple addition and subtraction. 学生甚至不会做简单的加法和减法。
Children learning addition and subtraction. 学习加减发的儿童。
It's a matter of addition and subtraction. 其实就是人多了和人少了的问题.
Understand that addition and subtraction are inverse. 理解加法和减法是互为逆运算;
Three digits addition and subtraction with regrouping. 三位数的加减(进位和借位)
do addition and subtraction 做加减法
The danger students who can not even do simple addition and subtraction. 危险的地方还在于，学生们可能甚至不能做简单的加减法。
Oliver's Party: Learn addition and subtraction with Oliver and his friends. 奥利弗的派对:和奥利弗的朋友们一起学。
The + and - operators do perfectly ordinary addition and subtraction. 和-运算符执行通常的加减运算。
The first two basic operations in mathematics are addition and subtraction. 数学中两个最基础的运算是加和减。
The easiest one to remember is that multiplication and division happen before addition and subtraction. 其中，最简单的规则就是乘法和除法在加法和减法之前完成。
In this class we are going to learn the essence of addition and subtraction of decimals. 我们今天学习小数加、减法的意义及计算法则。
When combining addition and subtraction with multiplication and division it is necessary to take interim totals. 当加减法和乘除法联合运算时,必需取得中间和数。
The web is updated constantly with new additions and subtractions. 本网在收藏中建设，不断更新，添加和删除某些内容。
When combining addition and subtraction with multiplication and division it is unnecessary to take interim totals. 当混合执行加减和乘除时,不需取得中间和数。
And the addition and subtraction assignment operators to add and remove handlers from the list. 以及加法和减法赋值运算符在列表中添加和移除处理程序。