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a×b+a×c=10. calculeaza 3×a×(b+c)

Răspuns :

a×b+a×c=10
ax(b+c)=10
3×a×(b+c)=3x10=30
ab+ac=10
a(b+c)=10
3a(b+c)=10x3
a(b+c)=30