Question

Se x=1, y=2x e z=2y, o valor de x+y+z é:
(A) 3;
(B) 5;
(C) 7;
(D) 9.

Answer 1

resposta:(b)5
1+2x+2y=5xy

Answer 2

X + Y + Z
1 + 2 . 1 + 2 . (2 . 1)
1 + 2 + 2 . 2
3 + 4
7
Alternativa correta "C"