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stiind ca a×b=480 a×c=280 calculeaza a×(b+c)

Răspuns :

a×(b+c)= a×b+a×c=480+280=760

a*b=480
a*c=280
Le adunam
ab+ac=?
480+280= 760
a(b+c)=?
Deafacem paranteza
ab+ac=?
Dar noi am calculat deja ab+ac
=> a(b+c)= ab+ac=760