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Daca a•(b-c)=3\4 si a•c=2,75,atunci a•b=....

Răspuns :

a(b-c)=ab-ac=3/4; ac=2,75; ab-11/4=3/4; ab=11/4+3/4=14/4
a*(b-c)=a*b-a*c 3\4 = 0, 75 0, 75= a*b - 2, 75 A*b=0, 75+2, 75 a*b=3, 5