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a fost răspuns

Descopuneti in factori :

b) -3a( x + 3 ) + 6b( x + 3)
d) (x + 2)(x - 3) + (x + 2)(2x + 1)
f) (x + 1)(5x + 6) - (5x -7)(x + 1)

Va rog repede.