gấp ajjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj

Đáp án:

Giải thích các bước giải:

 ` a) x²-2=(x-\sqrt{2})(x+\sqrt{2}) `

 ` b) 3x²-1=(\sqrt{3}x-1)(\sqrt{3}x+1) `

 ` c) 4x²-5=(2x-\sqrt{5})(2x+\sqrt{5}) `

 ` d) \sqrt{x³}+\sqrt{y³}=(x^(1/2)+y^(1/2))(x-x^(1/2) y^(1/2)+y) `

 ` e) \sqrt{x³}-8=(x^(1/2)-2)(x+2.x^(1/2)+4) `

 ` f) 9x+6\sqrt{xy}+y `

` = \sqrt{3x}²+2.3\sqrt{xy}+\sqrt{y}² `

` = (\sqrt{3x+y})² `