Question

Tìm số x không âm , biết :

a) \(\sqrt{x}\)= 15

b) \(2\sqrt{x}\)= 14

c) 2\(2\sqrt{x}\) < 4

Answer 1

Giúp mình với 

Answer 2

a, x = 225

b, x = 49

c, x < 4

Answer 3

\(a.\sqrt{x}=15\)

\(\Leftrightarrow x=15^2=225\)

\(b.2\sqrt{x}=14\)

\(\Leftrightarrow\sqrt{x}=7\)

\(\Leftrightarrow x=7^2=49\)

\(c.22\sqrt{x}< 4\)

\(\Leftrightarrow\sqrt{x}< \dfrac{2}{11}\)

\(\Leftrightarrow x< \left(\dfrac{2}{11}\right)^2\)

\(\Leftrightarrow x< \dfrac{4}{121}\)