Question

Problema 3. Fie a, b, c, trei numerel naturale, astfel incat, 3 x a + 2 x b+ 4 x c=494

si b + 2 x c=160.Determinati suma a x b + 2 x a x c

URGENTTTTTT!!!!!!!!!REzolvare de clasa a iv-a

Answer 1

Răspuns:

a×b+2×a×c=334

Explicație:

3×a+2×b+4×c=494

b+2×c=160

dăm factor comun pe 2

3×a+2×(b+2×c)=494

3×a+2×160=494

3×a+320=494

3×a=174

a=58

_______________

b+2×c=160

b×c=158

a×b+2×a×c=

=58×b+2×58×c=

=58+2×58+(b×c)=

=58+118+158=

=176+158=

=334