Question

4X + Y egal 700 Y + zet egal 500 X + zet egal 800 X ori Y ori zet egal?.

Answer 1

Răspuns:

-12×10⁶

Explicație pas cu pas:

$4x + y = 700 \\ y + z = 500 \implies y = 500 - z \\ x + z = 800 \implies x = 800 - z \\ 4(800 - z) + 500 - z = 700 \\ 3200 - 4z + 500 - z = 700 \\ 5z = 3000 \implies z = 600\\ x = 800 - 600 \implies x = 200 \\ y = 500 - 600 \implies y = - 100$

$x \cdot y \cdot z = 200 \cdot ( - 100) \cdot 600 = \bf - 12 \cdot {10}^{6}$