I don't know if Mr.White____ watch the soccer game with us next weekend.
I think he will if he ____free.( )
will go; is
will go; will be
goes; is
goes; will be
在△ABC中,若,则B等于()
已知数列的前n项和为,则的值为()
数列的通项公式,则该数列的前()项之和等于。
若,则下列不等式恒成立的是().
设直角△ABC的三个顶点都在单位圆x2+ y2=1上,点M(,),则的最大值是()