【高考冲刺】2019届高考数学(理)倒计时模拟卷(1)(Word版,含答案)

132方程为(x?)2?(y?)?1,去掉点(0,0).

2223.1.当x?1?0即x??1时, x?1?2x?1,∴?1?x?0,

当x?1?0即x??1时, ?x?1?2x?1∴x??1,

∴不等式的解集为?x|x?0?.

2.∵f?x?2??x?1,f?x?6??x?7

∴x?1?x?7?m

∵?x?R,使不等式x?1?x?7?m成立.

∴m大于x?1?x?7的最小值

∴m??8.