Question

請?jiān)趫D中作出線段使其平分且長度等于．
(要求：用尺規(guī)作圖，并寫出已知、求作，保留作圖痕跡，不寫作法和結(jié)論)

Answer 1

解：兩邊同乘以得



  ····························4分
經(jīng)檢驗(yàn)：是原方程的根。
∴原方程的解為： ····························6分
19．已知：線段m，∠BAC·························1分
求作：線段AD,使得∠BAD=∠CAD.  AD="m" ····2分
畫圖·········································4分解析:
略