计算器广泛的应用在生活方面，计算器可以进行简单的四则运算（加、减、乘、除）。键入数字时，按下相应的数字键，如果按错可用（CB）键消去一次数值，再重新输入正确的数字, 接输入数字后，按下乘号将它变为乘数，在不输入被乘数的情况下直接按（=）键，就是该数字的二次方值。根号（sqrt）键默认是开二次方根,按下（+/-）键可改变数字的正负值。-Calculator widely used in life, a simple calculator can be the four fundamental operations (addition, subtraction, multiplication, division). Type the number, press the corresponding number key, if used by mistake (CB) eliminate a key value, and then re-enter the correct number, then enter a number, press it into a multiplier multiplication, without input is directly by the case of the multiplier (=) key, that is, the value of the square of the number. Roots (sqrt) the default is to open the second root key, press the (+/-) keys to change the number of positive and negative.