division and square-root arithmetic 除法和平方根运算
This paper gives a method to calculate the arithmetic square root by iteration with given accuracy, analyses the iteration error and provides a selected range of initial value with the given accuracy.
本文给出了在预定精确度下用迭代法计算算术平方根的方法，并分析了迭代的误差，给出了预定精确度下初始值的一个选取范围。
Almost calculator can finish basic arithmetic and root square operation. The science calculator can even process trigonometric function, exponential function and logarithmic function.
一般的计算器都具有四则运算、开方运算等功能，而科学计算器还具有三角函数，指数函数，对数函数等运算功能。
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