Пошаговое объяснение:
(a+2)(a+4)-=+4a+2a+8-(+2a+1)=+4a+2a+8--2a-1=4a+7
-(a+1)(a+2)=-2a+1-(+2a+a+2)=-2a+1-(+3a+2)=-2a+1--3a-2=-5a-1
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Пошаговое объяснение:
(a+2)(a+4)-=+4a+2a+8-(+2a+1)=+4a+2a+8--2a-1=4a+7
-(a+1)(a+2)=-2a+1-(+2a+a+2)=-2a+1-(+3a+2)=-2a+1--3a-2=-5a-1