在输入框中填写四则表达式,点选计算按钮即可在输出框中看到结果.例如:在输入框中填写(8+2)*5则输出框中显示50-In the input box four expressions, click the calculate button to see the results in the output box. For example: In the input box (8+2)* 5 display the output box 50