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b)(2a+1)(a²+b)= 2a³+2ab+a²+b
c) (x-y)(z+1)= xz+x-yz-y
b)(2a+1)(a²+b)=2a(sześcian) +2ab+a²+b
c) (x-y)(z+1)=xz+x-yz-y
b)2a*a*a+2ab+a*a*+b=2a(do 5 potegi)+2ab+b
c)xz+x-yz+y