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a)5(x+2y)
b)4(m+1)
c)3(a-1)
d)x(5y-1)
e)2a(-3a-1)
ad2.
a)2x(1-y)
b)4x(1-2y)
a.5(x+2y)
b.4(m+1)
c.3(a-1)
d.x(5y-1)
e.36akwadrat-2a=2a(18a-1)