Toán Lớp 8: (y ³ -y ²) -4y ² + 8y -4 = 0
Tìm y
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Toán Lớp 8: (y ³ -y ²) -4y ² + 8y -4 = 0
Tìm y
Comments ( 1 )
<=>$y^2(y-1)-4(y^2-2y+1)=0$
<=>$y^2(y-1)-4(y-1)^2=0$
<=>$(y-1)(y^2-4)=0$
<=>\(\left[ \begin{array}{l}y-1=0\\y^2-4=0\end{array} \right.\) <=>\(\left[ \begin{array}{l}y =1\\y^2=4\end{array} \right.\) <=>\(\left[ \begin{array}{l}x=1\\x=\pm2\end{array} \right.\)