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$�� 12.9. �� :�) {2x^2+x+3>0, x^2-9?0}; �) {5x-7x^2-3>0, x^2-250}; �) {x^2+7x+6?0,...$

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12.9. �� :

�) {2x^2+x+3>0, x^2-9?0}; �) {5x-7x^2-3>0, x^2-25<0};

�) {9x^2-1<0, x^2>3x-2}; �) {49x^2-4<0, x^2>5x-6};

�) {x^2?16, x^2+7x+12>0}; �) {x^2+7x+6?0, x^2<36}.

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