Rozwiąż równania nie obliczając delty :
a) 16x² - 25 = 0
b) 6x² = -2x
c) x²- 6x + 9 = 0
d) (7x - 3)² = 81
e) 1 - 9x² = 0
f) x = -5x²
g) 4x² = 12x - 9
h) (2x - 5)² = 36
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