1) 2/3 + (10 1/3)=2/3+31/3=11
2) 2/9+(-1 5/6)=2/9-1 5/6=2/9-11/6= - 29/18
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1) 2/3 + (10 1/3)=2/3+31/3=11
2) 2/9+(-1 5/6)=2/9-1 5/6=2/9-11/6= - 29/18