设有两个命题:p:不等式|x|+|x-1|≥m的解集为R;q:函数f(x)=-(7-3m

设有两个命题:p:不等式|x|+|x-1|≥m的解集为R;q:函数fx)=-(7-3mx是减函数.若这两个命题中有且只有一个真命题,求实数m的范围.

答案

解:

p为真命题,则根据绝对值的几何意义可知m≤1.若q为真命题,则7-3m>0,所以m.若pq假,则m.若pq真,则1<m.

综上所述,1<m.

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