Question

60. Calcule mentalmente o valor de x.
a) x + 3=7 c) dx +7=7
b) 25x = 12​

Answer 1

a) x + 3 = 7

x = 7 - 3

x = 4

b) 25x = 12

x = 12/25 = 0,48

c) x + 7 = 7

x = 7 - 7

x = 0

Answer 2

Olá, boa tarde!

Resposta:

A) x = 4

B) x = $\mathsf{\dfrac{12}{25}}$ ou 0,48

C) d = 0

Explicação passo-a-passo:

A) x + 3 = 7

$\mathsf{x + 3 = 7 }$

$\mathsf{x = 7 -3}$

$\boxed{\mathsf{x = 4}}$

________

B) 25x = 12

$\mathsf{25x = 12}$

$\mathsf{x = \dfrac{12}{25}}$

$\boxed{\mathsf{x = \dfrac{12}{25}\ \ \overrightarrow{ou} \ \ 0,48}}$

________

C) dx + 7 = 7

$\mathsf{dx + 7 = 7}$

$\mathsf{dx=7-7}$

$\mathsf{dx=0}$

$\mathsf{d=\dfrac{0}{x}}$

$\boxed{\mathsf{d = 0}}$

================== Espero ter ajudado ==================

Abraços!