x23x+1=33x4+x2+1
x4+x2+1=(x2+x+1)(x2-x+1)=ab
biến đổi 
x23x+1=2a2-b2
thay vào pt ta đc 2a2-b2+33ab=0
chia cả 2 vế cho a2 hoặc b2 rồi đặt ẩn phụ là okê nhé bạn
phương trình đẳng cấp nhé bạn

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