Exercice de 3ème : AIDEZ MOI SVP Factorise ces expressions.
E = (2 − x) au carré + (2 − x)(9 au carré + x)
F = (3 − 2x)(5 au carré + x) − (5 au carré + x)au carré
G = − (15 − x)au carré − (15 − x)(3 − x)
je ne comprend pas comment faire ...
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