1) =b^2-25-b^2=-25
2) = c^2+81-c^2=81
3) =1/9-z^2-1/9=-z^2
4) =d^2
5) =0,81-a^2-a-a^2=0,81-2a^2-a
6)=5k-k^2-1,44+k^2=5k-1,44
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Answers & Comments
1) =b^2-25-b^2=-25
2) = c^2+81-c^2=81
3) =1/9-z^2-1/9=-z^2
4) =d^2
5) =0,81-a^2-a-a^2=0,81-2a^2-a
6)=5k-k^2-1,44+k^2=5k-1,44