Tìm số nguyên x sao cho 3/x=x/12. A. x ∈ {48}. B. x ∈ {–6; 6}. C. x ∈ {–6}. D. x ∈ {6}.
Giải thích
Đáp án đúng là: B
3x=x12
x ⋅ x = 3 ⋅ 12
x ⋅ x = 36 = 6 ⋅ 6 = (–6) ⋅ (–6).
Vậy x ∈ {–6; 6}.
Đáp án đúng là: B
3x=x12
x ⋅ x = 3 ⋅ 12
x ⋅ x = 36 = 6 ⋅ 6 = (–6) ⋅ (–6).
Vậy x ∈ {–6; 6}.