下列图象可作为函数的图象的是
定义,若,则( )
Suppose the least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is
设为椭圆上一点,且,,其中为椭圆的两个焦点,则椭圆的离心率e的值等于
当x.yi满足条件时,变量U=的取值范围是
等差数列中有两项和,满足、,则该数列前mk项之和是