giải phương trình

B

bigtbang

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N

nguyenbahiep1

[laTEX]a = \sqrt{2+x} , b = 2\sqrt{2-x} \\ \\ dk: a,b \geq 0 \\ \\ 3(a-b) + 2ab = a^2+b^2 \Leftrightarrow 3(a-b) = (a-b)^2[/laTEX]
 
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