6x/x²-y²-3/x-y при x=-2/3;y3/4

х=-2/3. у=3/46х/х^2-у^2-3/х-у=6/х-3/х-у(у+1)=3/х-у(у+1)=3/-2/3-3/4(3/4+1)=-9/2--3/4×7/4=-9/2-21/4=-18-21/4=-39/4=-9,75