[Toán 11] Giải hệ phương trình

N

niemkieuloveahbu

[TEX]\left{\sqrt{2x-1}-y(1+2\sqrt{2x-1})=-8\\y^2+y\sqrt{2x-1}+2x=13\right.\\x \geq \frac{1}{2}\\ Dat\ \sqrt{2x-1}=t \Rightarrow x=\frac{t^2+1}{2}\\ He \Leftrightarrow \left{t-y(1+2t)=-8\\ y^2+yt+t^2=12\right.\\ Dat: \left{a=t-y\\b=ty\right. \Rightarrow a,b \Rightarrow x,y[/TEX]
 
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