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Alma12
a fost răspuns

daca a×b=3supra5si a×c=11supra 10, calculati (b+c)×a. daca a×b=1,(2) sia×c=0,(3), calculatia×(b-c).

Răspuns :

Cocirmariadenis
axb=3/5 si axc=11/10
(b+c) x a =axb + axc= 3/5 + 11/10 = 6/10+11/10=17/10=1,7

axb=1,(2)=(12-1) /9=11/9
axc=0,(3)= 3/9=1/3
a x ( b -c) = axb - axc= 11/9 - 1/3= 11/9 - 3/9 = 8/9= 0,(8)