解不等式组X2-2X-3M(X-3)(M
问题描述：
解不等式组X2-2X-3M(X-3)(M
答
x^2-2x-3=(x-3)(x+1)0
x>-(3M+2)/(1-M)
-(3M+2)/(1-M)>=3时,无解.
-(3M+2)/(1-M)=-1/4时,-1