f'(x)=6x^2+3tx-3t^2令f'(x)=0,解得x=1/2t或x=-t当t>0时,1/2t>0当0
1/2t,f'(x)>0当1/2t>1时,即t>2f(x)为减函数f(x)max=f(0)=(t-1)/2>0f(x)min=f(1...
f'(x)=6x^2+3tx-3t^2令f'(x)=0,解得x=1/2t或x=-t当t>0时,1/2t>0当0
1/2t,f'(x)>0当1/2t>1时,即t>2f(x)为减函数f(x)max=f(0)=(t-1)/2>0f(x)min=f(1...