已知01
当x-1>0x>1时mx>x-3(1-m)x<3因为0则1-m>0既x<3/(1-m)故1当x-1<0x<1时mx(1-m)x>3同理x>3/(1-m)>1则无解 既1
mx/(x-3)>1m+3m/(x-3)>13m/(x-3)>1-mx-3>0且3m>(1-m)*3xx>3且x即:m/(1-m)