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(4x-5y)(2x+y)-(3x-y)(5y-4x)+(5y-4x)la patrat


Răspuns :

-22X(patrat) -17XY+10Y(patrat) 
-(5y-4x)(2x+y)-(3x-y)(5y-4x)+(5y-4x)²= (5y-4x) (-2x-y-3x+y+5y-4x)=
(5y-4x)(-9x+5y)= (5y-4x)(5y-9x)