表达式4: negative "x" plus 5 plus 1 half StartAbsoluteValue, "x" minus 1 , EndAbsoluteValue−x+5+12x−1
4
表达式5: 2 StartAbsoluteValue, "x" , EndAbsoluteValue plus StartAbsoluteValue, "x" plus 1 , EndAbsoluteValue2x+x+1
5
表达式6: StartAbsoluteValue, "x" plus 3 , EndAbsoluteValue plus 3 halves StartAbsoluteValue, "x" , EndAbsoluteValue plus StartAbsoluteValue, "x" minus 3 , EndAbsoluteValuex+3+32x+x−3