Question

[Trương Lê Thành Đạt]

nếu `1- 4/x +4/x^2 =0` thì `2/x` bằng ?

Answer 1

[Lấp La Lấp Lánh]

\(1-\dfrac{4}{x}+\dfrac{4}{x^2}=0\)

\(\Rightarrow\left(\dfrac{2}{x}-1\right)^2=0\)

\(\Rightarrow\dfrac{2}{x}=1\)

Answer 2

[Nguyễn Hoàng Minh]

\(1-\dfrac{4}{x}+\dfrac{4}{x^2}=0\\ \Rightarrow\left(1-\dfrac{2}{x}\right)^2=0\\ \Rightarrow1-\dfrac{2}{x}=0\Rightarrow\dfrac{2}{x}=1\)