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maiphuong10p
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[tex]\left\{ \begin 4\sqrt{1+x} + xy\sqrt{4+y^2} = 0 \\ log_2(x)=2^{y+2}[/tex]
mog mọi người giúp đỡ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
mog mọi người giúp đỡ
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