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= (a - b) (m + n)
2.- ax - 2bx - 2ay +4by = x(a - 2b) - 2y(a - 2b)
= (x - 2y) (a - 2b)
suerte
Caso.
Factor comun por agrupación de terminos.
am - bm + an - b n = Agrupas
(am - bm) + (an - bn) = Sacas factor común m y n
m(a - b) + n(a - b) = Sacas factor comun (a - b)
(a - b)(m + n)
ax - 2bx - 2ay + 4by) = Agrupas
(ax - 2bx) - (2ay - 4by) = Sacas factor comun x y 2y
x(a - 2b) - 2y(a - 2b) = Sacas factor comun (a - 2b)
(a - 2b)(x - 2y)