Question

Care sunt formulele de calcul prescurtat?

Answer 1

[tex](a+b)^2=a^2+2ab+b^2\\ (a-b)^2=a^2-2ab+b^2\\ (a+b)(a-b)=a^2-b^2\\ (a+b+c)^2=a^2+b^2+c^2+2ab+2ac+2bc[/tex]