Question

Determine o valor de cada quadrado . (A)⬛+(-8)-(-3)=7. (B)(+8)-(-⬛ )+(-3)=5. (C)(+48)-(-36)+(-40)-(+ ⬛ ) =-75

Answer 1

Resposta:

(A)⬛+(-8)-(-3)=7

$x - 8 + 3 - 7 = 0 \\ x - 12 = 0 \\ x = 12$

(B)(+8)-(-⬛ )+(-3)=5

$8 + x - 3 - 5 = 0 \\ x = 0$

(C)(+48)-(-36)+(-40)-(+ ⬛ ) =-75

$48 + 36 - 40 - x + 75 = 0 \\ - x + 119 = 0 \\ - x = - 119 \times ( - 1) \\ x = 119$