3)2b (m-n)8b (m-n) (m-n)4)3a (a+b)9a (a+b) (a-b). Created by nursuhamedovafarangi. algebra-ru

3)2b (m-n)8b (m-n) (m-n)4)3a (a+b)9a (a+b) (a-b)...

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$3)\frac{2b(m-n)}{8b(m-n)(m-n)}=\frac{2b}{2b*4*(m-n)}=\boxed{\frac{1}{4(m-n)}}\\\\\\4)\frac{3a(a+b)}{9a(a+b)(a-b)}=\frac{3a}{3a*3*(a-b)}=\boxed{\frac{1}{3(a-b)}}$

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