Factoriser les expressions puis résoudre les équations suivantes :

4x² - 8x + 4 = 0 ;

t²+20t+100 = 0 ;

9 - t² = 0 ;

16x² + 8x + 1 = 0 ;

49 - 64x² = 0 ;

1 - 6y + 9y² = 0

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