The proposition "1" for any x, x2+x+1> The negative number of 0' is
2. The asymptote equation of hyperbola x2/4-y2/ 16= 1 is
There are 2000 students in a school, including 700 sophomores. In order to understand ...
……
These are the first few questions, and I urgently need the answers to this test paper.
The second picture is 1. The frequency distribution histogram of the existing speed of 200 cars passing through a certain highway is as follows ...
2. Given sample 9, 19, 1 1, the average value of x and y is 10, and the standard deviation is root number 2, then xy=
……