题目

One day when government officers were rebuilding a barn(粮仓), they found a mouse hole in a corner and used smoke to force the mice inside the hole to come out.A while later they saw mice running out, one after another. Then, everyone thought that all the mice had come out. But just as they were about to start to clean up, they saw two mice getting out of the exit of the hole. After some hard tries, the mice finally got out. The strange thing was that after they came out of the hole, they did not run away at once. It seemed that one was trying to bite (咬) the tail of the other. Everyone wa等腰△ABC两边的长分别是一元二次方程x2-5x+6=0的两个解，则这个等腰三角形的周长是    ．