If you feel stressed by responsibilities at work, you should take a step back and identify (识别) those of 56 (great)and less importance. Then, handle the most important tasks first so you
Five couples have been living side by side on Beasley Street in Pearce for 45 years. In May 1968, five young couples moved into new houses there. Fortyfive years later, they are still there, and al
.
时，求函数
的单调区间；
，若函数
上为减函数，求实数a的最小值；
上，若存在
，使得
成立，求实数a的取值范围.
