Xet x=0y=0khonglanghiem (1)pt1<=>x3−y6+xy2−y4=0<=>(x−y2)(x2+y4+xy2+y2)=0$<=>x=y^{2} do x^{2}+y^{4}+xy^{2}+y^{2}=(x+\frac{1}{2}y^{2})^{2}+\frac{3}{4}y^{4}+y^{2}>0 vi (1)Thayy^{2}=xvaopt2taco\sqrt{4x+5}+\sqrt{x+8}=6$Cai nay bt roi nha. Minh lam den day thoi!!!!!!^^
Xet
x=0y=0khonglanghiem (1)
pt1<=>x3−y6+xy2−y4=0<=>(x−y2)(x2+y4+xy2+y2)=0$<=>x=y^{2}
ho
ặc x^{2}+y^{4}+xy^{2}+y^{2}=
0\Leftrightarrow (x+\frac{1}{2}y^{2})^{2}+\frac{3}{4}y^{4}+y^{2}
= 0\Leftri
ghtarrow x=y=0 Thayy^{2}=x
vaopt2taco\sqrt{4x+5}+\sqrt{x+8}=6$Cai nay bt roi nha. Minh lam den day thoi!!!!!!^^