题目

San Francisco is a great city. It is lively and friendly, and has many things to do. Below you’ll find some ideas about activities and programs in San Francisco for the summer. The San Francisco School: Summer Program    There are camps for pre-kindergarten（学前班）through middle school at The San Francisco School. With programs like “Fearless Writing”, “Making A Green World:Re-Making Clothing” and so much more(check which programs are for which ages). This is a great place for children to have fun in the summer. Registration(登记) starts in the spring. San Francis已知函数f（x）=（2x-a）2+（2-x+a）2，x∈[-1，1]．（1）求f（x）的最小值；（2）关于x的方程f（x）=2a2有解，求实数a的取值范围．