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Stiind ca a×(b+c)=2640 si a×b=1240, calculeaza a×c

Răspuns :

Axb+axc=2640
1240+axc=2640
Axc=26 40-1240
Axc=1400

ax(b+c)=axb + axc=1240+axc=2640

axc=2640-1240

axc=1400

axb+axc=1240+1400=2640 verificare