—Why me ? Mike is sitting there doing nothing.
如图是由边长相同的小正方形组成的网格,A,B,P,Q四点均在正方形网格的格点上,线段AB,PQ相交于点M,则图中∠QMB的正切值是( )
若二次根式x-5在实数范围内有意义,则x的取值范围是____ .
Can you say it ____ ?(再一次)