(1)=x方-2mx+m方-(x-m)
=(x-m)方-(x-m)
=(x-m)(x-m-1)=0
得x=m或x=m+1
(2)(x-a)方=b(x-a)(x+a)
(x-a)(x-a-b(x+a))=0
得x=a或x=(a+ab)/(1-b)