L
lovelovelove_96


Câu 1:[TEX]\left{\begin{\sqrt{x+y} - \sqrt{x-y}=2}\\{\sqrt{x^2+y^2} + \sqrt{x^2-y^2} =4} [/TEX]
Câu 2:[TEX]\left{\begin{\sqrt[3]{x-y}= \sqrt{x-y}}\\{\sqrt[3]{x+y}= \sqrt{x+y-4}} [/TEX]
Câu 2:[TEX]\left{\begin{\sqrt[3]{x-y}= \sqrt{x-y}}\\{\sqrt[3]{x+y}= \sqrt{x+y-4}} [/TEX]