|+56|+|-12|+|+11.3|+|-7.4|+|+8.1|+|-2.5|
=56+12+11.3+7.4+8.1+2.5
=56+12+11.3+（8.1+2.5+7.4）
=56+12+11.3+18
=56+（12+18）+11.3
=56+30+11.3
=86+11.3
=97.3