(-7又2/3)+(+4又1/2)-1/2= 49又1/7+(-77.21+(-22.79)=
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(-7又2/3)+(+4又1/2)-1/2=49又1/7+(-77.21+(-22.79)=(-7又2/3)+(+4又1/2)-1/2=49又1/7+(-77.21+(-22.79)=(-7又2/3)
(-7又2/3)+(+4又1/2)-1/2= 49又1/7+(-77.21+(-22.79)=
(-7又2/3)+(+4又1/2)-1/2= 49又1/7+(-77.21+(-22.79)=
(-7又2/3)+(+4又1/2)-1/2= 49又1/7+(-77.21+(-22.79)=
(-7又2/3)+(+4又1/2)-1/2
= -23/3+4+1/2-1/2
=-11/3
49又1/7+(-77.21+(-22.79)
=49+1/7-(100)
=-51+1/7
=-50又6/7