490÷40正确的计算结果是( )
有两根木棒(如下图),长分别是44厘米和56厘米.要把它们截成同样长的小棒,不能剩余,每根小棒最长是____厘米?
—Do you know girl who is standing under tree?
—Of course! She is Lucy, my classmate.
函数fx=sinxsinx+π2的最小正周期为( )