Question

equação de primeiro grau

Exercicios:
a) x-4=7
b) x+5=12
c) x-8=14
d) x-6=24
e) 2x=20
f) 3x=15
g) x/10-5
h) x/6=2
i) 2x/5=40​

Answer 1

Resposta:

b) x+5=12

<=> x = 12 - 5

<=> x = 7

c) x-8=14

x = 14+8

x = 22

d) x-6=24

x = 24 + 6

x = 30

e)

$2x = 20 \\ x = \frac{20}{2} \\ x = 10$

f)

$3x = 15 \\ x = \frac{15}{3} \\ x = 5$

g) x/10-5

$\frac{x}{10} = 5 \\ x = 5 \times 10 \\ x = 50$

h) x/6=2

$\frac{x}{6} = 2 \\ x = 2 \times 6 \\ x = 12$

i) 2x/5=40

$\frac{2x}{5} = 40 \\ 2x = 40 \times 5 \\ 2x = 200 \\ x = \frac{200}{2} \\ x = 100$

Answer 2

Resposta:

A) 7 + 4 = x

X = 11

B) 12 - 5 = x

X = 7

C) 14 + 8 = x

X = 22

D) 24 + 6 = x

X = 30

E) 20 / 2 = x

X = 10

F) 15 / 3 = x

X = 5

G) 5 * 10 = x

X = 50

H) 2 * 6 = x

X = 12

I) 40 * 5 = 2x

200 = 2x

200 / 2 = x

X = 100

Explicação passo a passo: