【简答题】完形填空。 One day, I was walking with my daughter, and we saw a man picking bottles out of garbage cans (垃圾 箱). He did not ask us for spare 1 , like others had before him. My 10-year-old daughter asked 2 ...
【简答题】巳知二次函数 y = a ( x 2 -6 x +8)( a >0)的图象与 x 轴分别交于点 A 、 B ,与 y 轴交于点 C .点 D 是抛物线的顶点. (1)如图①.连接 AC ,将△ OAC 沿直线 AC 翻折,若点 O 的对应点0'恰好落在该抛物线的对称轴上,求实数 a 的值; (2)如图②,在正方形 EFGH 中,点 E 、 F 的坐标分别是(4,4)、(4,3),边 HG 位于边 ...