最少要选____人才能保证至少有2人是在同一个月出生的。
将1,3,5,7,9五个数填入方格中,使横行、竖行上的三个数相加得17.
把正确对话的代表字母写在横线上。
①Here you are, Grandma. ____ A. They are in my bag.
②What do you need? ____ B. I need some orange juice.
③Where are my rulers? ____ C. Great!
④Let's have lunch, Sally. ____ D. Thank you, Sally.
157×52=____
10km____10000m
50mm____6cm
已知集合A={x|x>1},B={x|x2﹣2x<0},则A∪B=( )