566. Верно ли при любом значении х неравенство:
a) 6x² - 10x + 7>0;
б) 2x² + 7x + 1 > 10x -1;
в) x² + 8x + 1 > −x² + 10x − 2;
г) -2x² + 10x < 18 - 2x?
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