Question

tìm y:

y x y = 30

 

Answer 1

\(y.y=30\Rightarrow y^2=30\Rightarrow y=\hept{\begin{cases}\sqrt{30}\\-\sqrt{30}\end{cases}}\)(Tíck nha!)

Answer 2

yxy=30 

y²=30

\(\Rightarrow y=\sqrt{30}\)

Answer 3

\(y.y=30\)

\(=>x=\orbr{\begin{cases}-\sqrt{30}\\\sqrt{30}\end{cases}}\)

Answer 4

đề sai chỗ nào ko bạn