а) 9b^2-(a-3b)^2 ;


б) (5a+7b)^2-70ab ;


в) (8a-b)^2-64a^2 ;


г) (5+y)^2+y(y-7) ;


д) a(4-a)+(4-a)^2 ;


е) (x-8)^2-2x(6-x)^2 ;


ж) (c+7)*c-(1-c)^2 ;


з) 2(a-b)^2 ;

 

и) a(1+2a)^2 ;


к) -6(2x-y)^2 ;

 

л) -y(3x-y)^2.

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