1.We offered hin our congratulations( )his passing the colledge entrance exams.

题目

1.We offered hin our congratulations( )his passing the colledge entrance exams.
a.at b.on c.for d.of
2.-Would you like to go shopping tomorrow?
-If Tom does,( )
a.so do I b.so shall I c.so do I d.so I shall
3.在矩形ABCD中,AC,BD交于点O,AE平分角BAD.若角EAO=15度,求角BOE的度数
4.已知,在平行四边形ABCD中,以AC为斜边作直角三角形ACE,且角BED为直角
求证:四边形ABCD是矩形
图没有,不过如果想拿到分的话,就自己画吧,一定能画的出来的.而且,

答案

1 C2 So do I3因为矩形 ∠BAE=45°∠EAO=15°所以∠BAO=60° 所以AB=AO=BO因为AE=√2*AO AC=2AO ∠EAC=15°则AO/AE=AE/AC=√2/2所以△AOE≌△AEC所以∠AOE=135°所以∠BOE=135°-60°=75°4设AC BD交点为O 连接OE因...