(1)(+1/2)+(-1/2)+(-6/7)
=0-6/7
=-6/7
(2)0.5+(-1/4)+0.75+(+1/2)
=(0.5+1/2)+(-1/4+0.75)
=1+0.5
=1.5
(3)1/4+(+5又3/5)+(-0.25)+(-3又1/8)
=(1/4-0.25)+(5又3/5-3又1/8)
=0+2又19/40
=2又19/40
(4)-1.5+1.75+(-3.75)+(-1.5)
=(-1.5-1.5)+(1.75-3.75)
=-3-2
=-5
(1)(+1/2)+(-1/2)+(-6/7)
=0-6/7
=-6/7
(2)0.5+(-1/4)+0.75+(+1/2)
=(0.5+1/2)+(-1/4+0.75)
=1+0.5
=1.5
(3)1/4+(+5又3/5)+(-0.25)+(-3又1/8)
=(1/4-0.25)+(5又3/5-3又1/8)
=0+2又19/40
=2又19/40
(4)-1.5+1.75+(-3.75)+(-1.5)
=(-1.5-1.5)+(1.75-3.75)
=-3-2
=-5