5.51. Решите совокупность 1) [21x² + 39 x-61; 4) x² +7x+100; уравнений: 2) 4x² + 5x>6, 7x> x²; 5) [xl-7>0, x+5x0; 6) [2x² + 5x+2 | |x|-1,5>0​
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