正五边形每个内角的度数为____
小军根据学习函数的经验,对函数y=﹣ x+2 +|x|的图象与性质进行了探究.
下面是小军的探究过程,请补充完整:
函数y=ex-ex的单调递增区间( )
如图所示,甲、乙两个实心正方体放置在水平表面上,它们对水平表面的压强相同。已知甲的质量为1千克,甲的底面积为0.01米2。求:
⑴made____ Look at that robot.
⑵strong____ My brother is hardworking.
⑶finish____ We can do our homework after dinner.
⑷girl____ My father helps him to clean his room.
⑸beautiful____ Li Hua is really clever.
近年来,学生安全事故频频发生:有的学生意外坠楼,朝气蓬勃的生命瞬间消逝;有的学生锻炼不当,运动中猝死;有的学生在放学回家途中遭遇车祸,不幸身亡……要有效遏制悲剧的发生( )