﹣How is Mary getting on with her lessons?
﹣She will fail the exam______ she studies harder.( )
after
unless
as soon as
when
已知函数,若,则实数()
设,,若,则实数的取值范围是()
设,则下列正确的是()
定义在R上的函数且当时,.则等于()
若函数有最小值,则的取值范围是()