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daca a·b=36 si ac =27 atunci calculati a·(b+c)si a·(b-c)

Răspuns :

ab+ac=36+27
a(b+c)=63

ab-ac=36-27
a(b-c)=9
a·(b+c)=a·b+a·c=36+27=63
a·(b-c)=a·b-a·c=36-27=9