-3,8+2 1/3=-3 4/5+2 1/3=-3 12/15+2 5/15=-1 7/15
-1 7/15*(-1 7/8)=-22/15*(-15/8)=11/4=2 3/4
4 1/6:(-1 2/3)=25/6*(-3/5)=-5/2=-2 1/2
2 3/4+(-2 1/2)=2 3/4-2 2/4=1/4
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-3,8+2 1/3=-3 4/5+2 1/3=-3 12/15+2 5/15=-1 7/15
-1 7/15*(-1 7/8)=-22/15*(-15/8)=11/4=2 3/4
4 1/6:(-1 2/3)=25/6*(-3/5)=-5/2=-2 1/2
2 3/4+(-2 1/2)=2 3/4-2 2/4=1/4