Toán Lớp 9: √(x-2√x-1)=2
giúp vs !!!!!!!!!!!!!!!!!!!!!!!!!!
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 9: √(x-2√x-1)=2
giúp vs !!!!!!!!!!!!!!!!!!!!!!!!!!
Comments ( 2 )
$x-2\sqrt{x-1}=4$
$⇔x-1-2\sqrt{x-1}+1=4$
$⇔(\sqrt{x-1}-1)^2=4(1)$
$⇔\sqrt{x-1}-1≥-1>-2$
$⇒(1)⇔\sqrt{x-1}-1=2$
$⇔\sqrt{x-1}=3$
$⇔x-1=9$
$⇔x=10(t/m)$
Vậy $x=10$