Question

鐪嬮? 鑷?繁鐪嬩笂鍘绘瘮杈冮毦

Answer 1

AC^2=AD^2+CD^2

AB^2=AD^2+BD^2

AC^2-AB^2=CD^2-BD^2=9^2-6^2=45

MC^2=MD^2+CD^2

MB^2=MD^2+BD^2

MC^2-MB^2=CD^2-BD^2=45

选C.