某人存了一笔三年定期存款，年利率为4.25%，今年到期后，连本带息取出11275元，他三年前存了多少元？设他三年前存了x元，则可列出方程 ____

阅读下面这首小令，完成小题。
                                                                                                   天净沙·春
                                                                                                  【元】白朴
                                                                                                春山暖日和风，
                                                                                                阑杆楼阁帘栊，
                                                                                                杨柳秋千院中。
                                                                                                啼莺舞燕，
                                                                                                小桥流水飞红。
     【注释】① 帘栊：带帘子的窗户。②飞红：花瓣飞舞，像落花。

我国人口最多的少数民族是（    ）