Tìm nghiệm nguyên x, y của phương trình:
\({x^2}{y^2} + {\left( {x - 1} \right)^2} + {\left( {y - 1} \right)^2} - 2xy\left( {x + y - 2} \right) = 2.\)
A.\(\left( {x;\,y} \right) = \left\{ {\left( {2;\,2} \right)\,\,;\,\,\left( {0;\,0} \right)\,\,;\,\,\left( {2;\,0} \right)\,\,;\,\,\left( {0;\,2} \right)} \right\}\)
B.\(\left( {x;\,y} \right) = \left\{ {\left( {2;\,2} \right)\,\,;\,\,\left( {0;\,0} \right)\,\,;\,\,\left( { - 2;\,0} \right)\,\,;\,\,\left( {0;\, - 2} \right)} \right\}\)
C.\(\left( {x;\,y} \right) = \left\{ {\left( { - 2;\, - 2} \right)\,\,;\,\,\left( {0;\,0} \right)\,\,;\,\,\left( {2;\,0} \right)\,\,;\,\,\left( {0;\,2} \right)} \right\}\)
D.\(\left( {x;\,y} \right) = \left\{ {\left( { - 2;\, - 2} \right)\,\,;\,\,\left( {0;\,0} \right)\,\,;\,\,\left( { - 2;\,0} \right)\,\,;\,\,\left( {0;\, - 2} \right)} \right\}\)