t的三次方+6t-20=0

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t的三次方+6t-20=0t的三次方+6t-20=0t的三次方+6t-20=0t^3+6t-20=0t^3+6t-20=0t^3-8+6t-12=0(t-2)(t^2+2t+4)+6(t-2)=0(t

t的三次方+6t-20=0
t的三次方+6t-20=0

t的三次方+6t-20=0
t^3+6t-20=0
t^3+6t-20=0
t^3-8+6t-12=0
(t-2)(t^2+2t+4)+6(t-2)=0
(t-2)(t^2+2t+4+6)=0
(t-2)(t^2+2t+10)=0
因为t^2+2t+10>0
所以t-2=0
t=2