t(t平方-3)=2,
t^3-3t-2=0,
t^3-t-2t-2=0,
t(t^2-1)-2(t+1)=0,
t(t-1)(t+1)-2(t+1)=0,
(t+1)(t^2-t-2)=0,
(t+1)(t-2)(t+1)=0,
(t+1)^2 *(t-2)=0,
得(t+1)^2 =0或者t-2=0,
解得t=-1(二重根)或2。
t^3-2t^2+2t^2-4t+t-2=0
(t-2)(t^2+2t+1)=0
(t-2)(t+1)^2=0
t=-1或2
3次方一般3个解 根据最容易猜的解 将次
t*(t^2-3)=2
t^3-t*3-2=0
(t-2)*(t+1)^2=0
所以t=-1或t=2
t(t平方-3
)=2,
t^3-3t-2=0,
t^3-t-2t-2=0,
t(t^2-1)-2(t+1)=0,
t(t-1)(t+1)-2(t+1)=0,
(t+1)(t^2-t-2)=0,
(t+1)(t-2)(t+1)=0,
(t+1)^2 *(t-2)=0,
得(t+1)^2 =0或者t-2=0,
解得t=-1或2。