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3.5.p.p / 5.p.p.q.q = 5q²
b)
9.x.3.y / 3 = 3xy
c)
(x+5) (x+2) = x² + 7x + 10
(x+5) (x-1) = x² +4x - 5
(x+5) (x+2) / (x+5) (x-1) = 2/-1= -2