商最高位是____位.
商是____位数.
设椭圆x2a2+y2b2=1(m>0,n>0)的右焦点与抛物线y2=8x的焦点相同,离心率为12,则此椭圆的方程为( )
John ________ play the guitar, but he wants to join the guitar club.