A:Yes, there is.
B:No, there are.
②方程x+ 2x =m+ 2m 的解为:x1=m;x2= 2m
③方程x- 3x =m- 3m 的解为:x1=m;x2= - 3m
归纳:④方程 x+ cx =b+ cb 的解为:x1= b ;x2= cb
应用:⑤利用④中的结论,直接解关于x的方程:x+ 2x−1 =a+ 2a−1
We were dying to hear the announcement of the winner of the race.