Question

 Giúp t voii

Answer 1

Câu 13

a) A = {1; 2; 3; 4; 5}

b) B = {5; 6; 7; 8; 9}

Câu 14:

a) 15 - 4x = 3

4x = 15 - 3

4x = 12

x = 12 : 4

x = 3

b) 5.3ˣ⁻¹ - 110 = 5⁵ : 5³

5.3ˣ⁻¹ - 110 = 5²

5.3ˣ⁻¹ - 110 = 25

5.3ˣ⁻¹ = 25 + 110

5.3ˣ⁻¹ = 135

3ˣ⁻¹ = 135 : 5

3ˣ⁻¹ = 27

3ˣ⁻¹ = 3³

x - 1 = 3

x = 3 + 1

x = 4