Aidez-moi svp! Factorisez avec les identités remarquables :

A= x²-49
B= x²+12x+36
C= 4x²- 4x+1
D= 36t²-144
E= 9x²-30x+25
F= 4-20x+25x²
G=9x²-25
H= 9x²-9
I= 3x²-27
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