Question

Calcule mentalmente o valor de x:

$x - 1 = 5$

$x + 0.5 = 10$

$0.4x + 5 = 9$

$x - \frac{1}{2} = 0.5$

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Answer 1

A) 6 - 1 = 5 (X = 6)

B) 9,5 + 0,5 = 10 (X = 9,5)

C) 0,4 • 10 + 5 = 9 (X = 10)

D) 1 - 1/2 = 0,5 (X = 1)