Question

Encontre o valor desconhecido (x), de acordo com o resultado das expressões numéricas:



a) √25 ÷ x + 10 = 11



x = .........



b) (8 ÷ 4) + √x – 3 = 8



x = .........



c) (2 + x) 2 + √36 = 15



x = .........



d) √36 . x + 5 = 17



x = .........



e) √16 . 5 + √x = 22



x = .........



f) √64 ÷ x + √8 ÷ 2 = 6



x = .........



g) (5 – x) 2 + √36 = 10



x = .........



h) 3 4 + (6 – x) 2 = 82



x = .........



i) 5 . x + √2 ÷ 2 + 7 = 23



x = .........



j) (√ 10 – 6) x + 3 3 = 31



x = .........



k) 1x + (√36 - √25) 2 = 2



x = .........



l) (√8 ÷ 2 + x)2 + √4 = 11



x = .........



m) 5 . √4 + 18 + x = 31



x = .........



n ) (√16 + √25 + √x) 2 = 36



x = .........



o) (x – 3)2 + (9 – 7)3 = 12 x = .........



x = .........



p) 10 ÷ x + √64 – 23 = 2



x = ........

Answer 1

a) √25 ÷ x + 10 = 11

5 ÷ x + 10 = 11

x = 11 - 10 - 5

x = -4

b) (8 ÷ 4) + √x - 3 = 8

2 + √x - 3 = 8

√x = 8 - 2 + 3

x = 9²

x = 81

c) (2 + x) 2 + √36 = 15

4 + 2x + 6 = 15

2x = 15 - 4 - 6

2x = 5

x = 2,5

d) √36 . x + 5 = 17

4 . x + 5 = 17

4x = 17 - 5

4x = 12

x = 12 ÷ 4

x = 3

e) √16 . 5 + √x = 22

4 . 5 + √x = 22

20 + √x = 22

√x = 22 - 20

√x = 2

x = 2²

x = 4

f) √64 ÷ x + √8 ÷ 2 = 6

8 ÷ x + √4 = 6

8 ÷ x + 2 = 6

x = 6 - 8 - 2

x = -4

g) (5 - x) 2 + √36 = 10

10 - 2x + √36 = 10

10 - 2x + 4 = 10

-2x = 10 - 10 - 4

-2x = -4

2x = 4

x = 4 ÷ 2

x = 2