(а+b)^2-1/a^2+2=
=a^2+2ab+b^2-1/a^2+2=
=(-2)^2+2×(-2)×1+1^2-1/(-2)^2-2=
=4-4+1-1/4-2=0+0/2=0;
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(а+b)^2-1/a^2+2=
=a^2+2ab+b^2-1/a^2+2=
=(-2)^2+2×(-2)×1+1^2-1/(-2)^2-2=
=4-4+1-1/4-2=0+0/2=0;