а)=3/6+2/6=5/6
б)=-2/10-5/10=-7/10
в)=7/21+3/21=10/21
г)=-11/22-2/22=-13/22
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а)=3/6+2/6=5/6
б)=-2/10-5/10=-7/10
в)=7/21+3/21=10/21
г)=-11/22-2/22=-13/22