表达式3: 1 half left parenthesis, StartAbsoluteValue, "x" minus 1 , EndAbsoluteValue positive StartAbsoluteValue, "x" minus left parenthesis, negative 5 , right parenthesis , EndAbsoluteValue , right parenthesis12x−1+x−−5
3
表达式4: 1 half left parenthesis, StartAbsoluteValue, "x" minus 1 , EndAbsoluteValue positive StartAbsoluteValue, "x" minus left parenthesis, negative 5 , right parenthesis , EndAbsoluteValue negative 6 , right parenthesis12x−1+x−−5−6