3. Решите уравнение:
1) 3x2 − 27 = 0; 4) x2 + 9x = 0;
2) 6,8x2 = 0; 5) 4x2 + 16x = 0;
3) 2x2 + 8 = 0; 6) 5x2 − 7x = 0.
4. Решите уравнение:
1) x2 + 8x − 9 = 0; 3) 3x2 − 8x − 3 = 0;
2) 2x2 + 7x − 4 = 0; 4) x2 + 2x − 5 = 0.
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