Fatore as expressões: a) x² + xy + x + y =

b) ab + 3b - 7a - 21 =

c) ax - ay =

d) 6x² - 4a = 

e) 15x³ - 21x² = 

f) 14x² + 42x = 

g) 6x + 6y + ax + ay =

h) ax + ay + 7x + 7y = 

i) 2a + 2m + ax + n a = 

j) 3a - 3b + ax - bx =

k) 7ax - 7a + bx - b =

l) 2x - 2 + 4 x - y = 

50 Pts porque a atividade é grande, obrigada...
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