Формула корня квадратного уравнения 1. Решите уравнение:
1)x² +8x-13 = 0;

2)2x²- 4x-17 = 0;

3)9x² +42x+49 =0;

4)x² -10x+37 = 0;

5)(3x+2)(x-4)=5;


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