bài toán khó

R

ronaldover7

$4x^2$+$y^2$=5xy
\Rightarrow $4x^2$-4xy+$y^2$-xy=0
\Rightarrow 4x(x-y)-y(x-y)=0 \Rightarrow (x-y)(4x-y) =0
mà 2x>y>0 \Rightarrow x-y=0 \Rightarrow x=y

tự làm típ nhé!
 
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