am+m-n+3m-3n-an= am+4m-4n-an=m(а+4)-n(а+4)=(а+4)(m- n)
3a-15+ax-5x=a(x+3)-5(х+3)= (а-5)(х+3)
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am+m-n+3m-3n-an= am+4m-4n-an=m(а+4)-n(а+4)=(а+4)(m- n)
3a-15+ax-5x=a(x+3)-5(х+3)= (а-5)(х+3)
m^4-5m^3+m-5=m(m^3+1)-5(m^3+1)=(m-5)(m^3+1)=(m-5)(m+1)(m^2-m+1)