设<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/dae2251ec8d441c6b2026d20818eae89.png?x-oss-process=image/sharpen,200"/> 为连续函数，<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/197aa2ec770d4e5b898effb5cc2fd43d.png?x-oss-process=image/sharpen,200"/>则<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/065b23d372cc40d7bc508a75a5567c23.png?x-oss-process=image/sharpen,200"/>（）.