如图，在正方形 ABCD 中， E 、 F 是对角线 BD 上两点，且 ∠ EAF = 45 ° ，将 ΔADF 绕点 A 顺时针旋转 90 ° 后，得到 ΔABQ ，连接 EQ ，求证：
（1） EA 是 ∠ QED 的平分线；
（2） E F 2 = B E 2 + D F 2 ．
Weather experts advise us out if PM2.5 levels are above 500.
Unemployment is rising and prices are increasing; , the economy is in trouble.
Once considered a of western culture, Valentine’s Day is becoming popular in China.
-Were you late for the film?-Very late. Half of it by the time we the cinema.
I didn’t think he actually got what I said he said that he had understood it completely.
粤公网安备 44130202000953号