t是实数,若a,b是关于x的一元二次方程x2-2x+t-1=0的两个非负实根,则(a2-1)(b2-1)的最小值是 .
A m is a person who plays an instrument or writes songs.
Yang Liwei was the first Chinese astronaut in s .
Most of the children in my time liked to play together under that big tree,e during the summer holidays when they had more free time.
Your classroom is on the second floor and o is on the third floor.
I said congratulations,walked over to him and s his hand.