她准备学习简单的加法和减法。
其中大多数可能都是不言自明的，比如加法、减法、乘法和除法。
Most of these are probably self-explanatory, like addition, subtraction, multiplication and division.
再按两次回车将显示加法和减法表达式。
Pressing return a couple more times will show an addition and subtraction.
那小男孩会做加法、减法和乘法，但不会做除法。
The little boy can add, subtract and multiply , but cannot divide.
理解加法和减法是互为逆运算；
学算术要学会加法和减法。
那小男孩会做加法、减法和乘法，但不会做除法。
The little boy can add, subtract and multiply, but cannot divide.
不一样加法和减法，反映的趋势是不一样的。
Not the same as addition and subtraction, reflecting the tendency is not the same.
测试涉及简单的计算，如加法和减法。
The test involves simple calculations, such as addition and subtraction.
测试涉及简单的计算，如加法和减法。
The test involves simple calculations, such as addition and subtraction.
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