一、找出问题以下是海淀区2011-2012学年度七年级第一学期期末统考的第27题:有一台单功能计算器,对任意两个整数只能完成求差后再取绝对值的运算,其运算过程是输入第一个整数x_1,只显示不运算,接着再输入整数x_2后则显示|x_1-x_2|的结果.比如依次输入1,2,则输出的结果是|1-2|=1;此后每输入一个整数都是与前次显示的结果进 First, to identify the problem The following is the Haida District 2011-2012 school year seven semester first semester exam 27: There is a single-function calculator, any two integers can only be completed after the difference between the absolute value of the operation , The calculation process is to enter the first integer x_1, only shows no operation, and then enter the integer x_2 after the result of | x_1-x_2 | For example, followed by the input 1, the output is | 1-2 | = 1; Each time an integer is entered, the result is the same as the one displayed last time