Найдите значение выражения:
[tex]1.x - y + \frac{1}{3} (y - x)[/tex]
если х-у=0.9;

[tex]2.x + y + \frac{1}{2} ( - x - y)[/tex]
если х+у=0.6;

[tex]3.x ^{2} - y ^{2} - 5x - 5y[/tex]
если х-у=7, х+у=4;

[tex]4.x ^{2} - y ^{2} + 4x + 4y[/tex]
если х-у=6, х+у=7.
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