tabC 解:X- =7 - =7-X X-1=49 X 2 -14X X 2 -15X 50=0 X 1 =10 tabC 解:X- =7 - =7-X X-1=49 X 2 -14X X 2 -15X 50=0 X 1 =10 发布时间:2025-05-31 03:09:28