Toán 9

C

chaugiang81

$a. ab + b\sqrt{a} + \sqrt{a} +1$ ( chắc đề là vầy )
$= b\sqrt{a}(\sqrt{a} +1) +( \sqrt{a} +1)$
$= (b\sqrt{a} +1)(\sqrt{a} +1)$

$b.\sqrt{x^3 }-\sqrt{y^3} + \sqrt{x^2 y} - \sqrt{xy^2}$
$=x\sqrt{x} - y\sqrt{y} + x\sqrt{y} - y\sqrt{x}$
$=x(\sqrt{x} + \sqrt{y} ) - y(\sqrt{y} + \sqrt{x} )$
$= (x-y)(\sqrt{x} + \sqrt{y})$
 
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