Question

Giải pt:

\(2\sqrt{8x}+7\sqrt{18x}=9-\sqrt{50x}\)

Answer 1

\(4\sqrt{2x}+21\sqrt{2x}=9-5\sqrt{2x}\)

\(30\sqrt{2x}=9\)

\(\sqrt{2x}=\dfrac{3}{10}\)

\(x=0.045\)

Answer 2

2√8x + 7√18x = 9 - √50x    Đk x >= 0

(=) 4√2x + 21√2x + 5√2x = 9

(=) 30 √2x = 9 

(=) √2x = 9/30

(=) 2x =9/100

(=) x = 9/200=0,045