J'ai besion d'aide pour calculer ces calculs:
Factoriser:
o= 2xau carre+3x
P=4xau carré+8x
q=5n-5p
r=49-63a
s=ab-bc
Compléter les espaces:
63-7x= (9- )
15x-20= (3x- )
6xau carré-x= ×x- ×x=( - ) x

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