Question

x*x=16/25

 

Answer 1

x*x=16/25

=>x*x=4/5*4/5

=>x=4/5

Answer 2

x=4/5

Answer 3

\(x^2=\frac{16}{25}\)

\(x^2=\left(\frac{4}{5}\right)^2\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{4}{5}\\x=-\frac{4}{5}\end{cases}}\)

Vậy x=4/5 hoặc x=-4/5

Answer 4

\(x\times x=\frac{16}{25}\)

\(x\times x=\sqrt{\frac{16}{25}}\times\sqrt{\frac{16}{25}}\)

\(x\times x=\frac{4}{5}\times\frac{4}{5}\)

Rút gọn ta sẽ có :

\(\frac{4}{5}\)