15 questões de Álgebra e Funções para o ENEM — Matemática

Question 1

Se 2x + 6 = 20, então x vale:

Accepted Answer

7

Answer

5

Answer

6

Answer

8

Answer

13

Question 2

Um produto de R$ 200 teve desconto de 15%. O novo preço é:

Accepted Answer

R$ 170

Answer

R$ 150

Answer

R$ 175

Answer

R$ 185

Answer

R$ 30

Question 3

As raízes de x² − 5x + 6 = 0 são:

Accepted Answer

2 e 3

Answer

1 e 6

Answer

−2 e −3

Answer

5 e 6

Answer

0 e 5

Question 4

Se f(x) = 3x − 4, então f(5) é:

Accepted Answer

11

Answer

9

Answer

15

Answer

19

Answer

1

Question 5

R$ 1.000 a juros simples de 2% ao mês, por 5 meses, rendem:

Accepted Answer

R$ 100

Answer

R$ 20

Answer

R$ 50

Answer

R$ 200

Answer

R$ 1.100

Question 6

Na PA (3, 7, 11, ...), o 10º termo é:

Accepted Answer

39

Answer

40

Answer

43

Answer

37

Answer

30

Question 7

Se 3 cadernos custam R$ 18, 7 cadernos custam:

Accepted Answer

R$ 42

Answer

R$ 36

Answer

R$ 48

Answer

R$ 21

Answer

R$ 54

Question 8

O valor de 2⁵ é:

Accepted Answer

32

Answer

10

Answer

25

Answer

16

Answer

64

Question 9

Um salário de R$ 2.000 teve aumento de 10% e depois mais 10%. O valor final é:

Accepted Answer

R$ 2.420

Answer

R$ 2.400

Answer

R$ 2.200

Answer

R$ 2.410

Answer

R$ 2.020

Question 10

Na PG (2, 6, 18, ...), a razão é:

Accepted Answer

3

Answer

2

Answer

4

Answer

6

Answer

12

Question 11

O gráfico de f(x) = 2x + 1 é uma:

Accepted Answer

Reta

Answer

Parábola

Answer

Hipérbole

Answer

Circunferência

Answer

Senoide

Question 12

Se 5 operários fazem uma obra em 12 dias, 10 operários (mesmo ritmo) fazem em:

Accepted Answer

6 dias

Answer

24 dias

Answer

10 dias

Answer

5 dias

Answer

12 dias

Question 13

O valor de log₁₀ 1000 é:

Accepted Answer

3

Answer

2

Answer

10

Answer

100

Answer

4

Question 14

A solução do sistema x + y = 10 e x − y = 2 é:

Accepted Answer

x=6, y=4

Answer

x=5, y=5

Answer

x=4, y=6

Answer

x=8, y=2

Answer

x=7, y=3

Question 15

A função f(x) = x² − 4x tem vértice com x igual a:

Accepted Answer

2

Answer

−2

Answer

4

Answer

0

Answer

−4