Gỉaỉ toán 9

N

nghgh97

tl

$\dfrac{{x\sqrt x - y\sqrt y }}{{x + y + \sqrt {xy} }} = \dfrac{{{{(\sqrt x )}^3} - {{(\sqrt y )}^3}}}{{x + y + \sqrt {xy} }} = \dfrac{{(\sqrt x - \sqrt y )(x + y + \sqrt {xy} )}}{{x + y + \sqrt {xy} }} = \sqrt x - \sqrt y $
 
M

maihoc98

Mình k pit viết căn bạn thông kam nhé
x căn x -y căn y\ x+y+cănxy
=căn x^3- căn y^3\ x+y+căn xy
=(căn x- căn y)(x+y+căn xy)\ x+y+can xy
=can x- can y
 
Last edited by a moderator:
You must log in or register to reply here.
Top Bottom