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Iliesandreicris
a fost răspuns

(a-b)(c-d)=?
(a-b)(c+d)=?
(a+b)(c-d)=?
(a+b)(c+d)=?

Răspuns :

Anazavalisca
(a-b)(c-d)=a*c-a*d-b*c+b*d
(a-b)(c+d)=a*c+a*d-b*c-b*d
(a+b)(c-d)=a*c-a*d+b*c-b*d
(a+b)(c+d)=a*c+a*d+b*c+b*d

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