3t+8/t=12,求t

问题描述:

3t+8/t=12,求t

两边同时乘以t得,3t+8=12t,3t-12t+8=0,3t-12t+12-4=0,3(t-4t+4)-4=0,3(t-2)=4,(t-2)=4/3,两边开平方,t-2=±√4/ √ 3=±2√3/3,t=2±2√3/3,即t=2+2√3/3或2-2√3/3.