Question

DAU 40 DE PUNCTE !

a) daca A = 57 si B+C = 91 calculati 3×A×B+3×A×C

b) daca B-C= 72 si A= 7 calculati 8×A×B-8+A×C​

Answer 1

Răspuns:

3AB+3AC=3A(B+C)=3·57·91=15561

8AB-8AC=8A(B-C)=8·7·72=4032

Answer 2

a)

A = 57

B + C = 91

3 × A × B + 3 × A × C =

3 × 57 × B + 3 × 57 × C =

171 × B + 171 × C =

171 × ( B + C ) =

171 × 91 = 15561

b)

B - C = 72

A = 7

8 × A × B - 8 × A × C =

8 × 7 × B - 8 × 7 × C =

56 × B - 56 × C =

56 × ( B - C ) =

56 × 72 = 4032