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a=5 6b+6c=12 8b-8c=16 calculati a×b+a×c

Răspuns :

a=5
6(b+c)=12----> b+c=2
a x b+ a x c = a(b+c)= 5 x 2 =10
6b+6c=12 |:6
b+c=2
a=5
a×b+axc=a×(b+c)
5x2=10