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Radualexandra17
a fost răspuns

Daca a ori ”x” b= -2/5 si a ori ”x” c= 1/3, atunci: a) a ori ”x”(b+c)=............................................ b) a ori ”x” (b - c)=.......................................

Răspuns :

a*b=-2/5
a*c=1/3

Adunand relatiile: a*b+a*c=-2/5+1/3
scoatem a factor comun a(b+c)=-2/5+1/3
a(b+c)=[(-2*3)+(1*5)]/15=-1/15

Scazand relatiile a*b-a*c=-2/5-1/3
a(b-c)=-2/5-1/3=-(-6-5)/15=-11/15

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