Question

ko dự đoán kết quả phép tính, nêu dự đoán kết quả tìm x

x * x = 4/9

Answer 1

\(x\cdot x=\dfrac{4}{9}\Rightarrow x^2=\dfrac{4}{9}\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{2}{3}\end{matrix}\right.\)

Answer 2

\(x=\dfrac{-2}{3}\)

Answer 3

x = \(\dfrac{2}{3}\)

Vì x . x = x²

và \(\dfrac{4}{9}=\dfrac{2}{3}\) nên x = \(\dfrac{2}{3}\)

Answer 4

\(x\times x=\dfrac{4}{9}\rightarrow x^2=\dfrac{4}{9}\)

mà \(\dfrac{4}{9}=\left(\dfrac{2}{3}\right)^2\)

\(\rightarrow x=\dfrac{2}{3}\)

Answer 5

\(x.x=\dfrac{4}{9}\)

\(\Rightarrow x^2\) \(=\left(\dfrac{2}{3}\right)^2\)

\(\Rightarrow x=\dfrac{2}{3}\)

Answer 6

Ta có: \(x^2=\dfrac{4}{9}\)

nên \(x\in\left\{\dfrac{2}{3};-\dfrac{2}{3}\right\}\)

Answer 7

Đ/s: 2/3

Answer 8

2/3