(z^2-z)(z+2)(z+3)=18z(z-1)(z+2)(z+3)=18(z^2+2z)(z^2+2z-3)=18Đặt z^2+2z=yy(y-3)=18 y^2-3y-18=0y=6 hoặc y= -3thay vào tìm z
(z^2-z)(z+2)(z+3)=18z(z-1)(z+2)(z+3)=18(z^2+2z)(z^2+2z-3)=18Đặt z^2+2z=yy(y-3)=18 ok chưa ạ ?
(z^2-z)(z+2)(z+3)=18z(z-1)(z+2)(z+3)=18(z^2+2z)(z^2+2z-3)=18Đặt z^2+2z=yy(y-3)=18
y^2-3y-18=0y=6 ho
ặc
y= -3tha
y vào tìm z