﹣﹣﹣Look!The kids are playing on the playground.
﹣﹣﹣______ great time they are having!( )
What
How
What a
How a
在中,角A、B、C所对的边长分别为,若成等比数列且,则等于() A. B. C. D.
设的内角所对的边分别为,若则的形状为()
数列的前n项和为,那么该数列前2n项中所有奇数位置的项的和为()
设的内角所对的边分别为.若,则角()
已知是等差数列,且,则()