Question

calcule mentalmente o valor de x

A) x+5=7
B)x+12=10
C)x-5=6
D)9x=27
E)x/4=6
F)16x=-32
G)0,7x=1,4
H)-5x=30
I)x/-2=5
J)x/-4=-2

Answer 1

Olá!

a) x = 2

b) x = -2

c) x = 11

d) x = 3

e) x = 24

f) x = -2

g) x = 2

h) x = -6

i) x = -10

j) x = 8

Espero ter ajudado, bons estudos!

Answer 2

Boa noite!

A)

x + 5 = 7
x = 7 - 5
x = 2

B)

x + 12 = 10
x = 10 - 12
x = - 2

C)

x - 5 = 6
x = 6 + 5
x = 11

D)

9x = 27
9x ÷ 9 = 27 ÷ 9
x = 27 ÷ 9
x = 3

E)

x/4 = 6
4x x/4 = 4 × 6
x = 4 × 6
x = 24

F)

16x = - 32
16x ÷ 6 = - 32 ÷ 16
x = - 32 ÷ 16
x = - 2

G)

0,7x = 1,4
0,7x ÷ 0,7 = 1,4 ÷ 0,7
x = 1,4 ÷ 0,7
x = 2

H)

- 5x = 30
- 5x ÷ (- 5) = 30 ÷ (- 5)
x = 30 ÷ (- 5)
x = - 30 ÷ 5
x = - 6

I)

x/- 2 = 5
- 2 × x/- 2 = - 2 × 5
2 × x/2 = - 2 × 5
x = - 2 × 5
x = - 10

J)

x/ - 4 = - 2
- 4 × x/ - 4 × (- 2)
4 × x/4 = - 4 × (- 2)
4 × x/4 = 4 × 2
x = 4 × 2
x = 8

Espero ter ajudado!