September 2018 1 19 Report

Wykaż że

a) (a-b)(a^{2}+ab+b^{2})=a^{3}-b^{3}

b) (a-b)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3}

c) (a+b)(a^{2}-ab+b^{2})=a^{3}+b^{3}


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