5.2-(-3/4)+(+5/6)-(-7/12)
=26/5+3/4+5/6+7/12
=312/60+45/60+50/60+35/60
=221/30

|+3又8/11|-|-27/10|-|19/11|+|-9/5|
=41/11-27/10-19/11+9/5
=(41/11-19/11)+(9/5-27/10)
=2+(18/10-27/10)
=2+(-9/10)
=2-9/10
=11/10