在实数范围内因式分9x2-5=______.
9x2-5=(3x)2-(5)2,
=(3x-5)(3x+5).
Bridge Street is a good place _______.
A. have fun B. to have fun C. having fun D to having fun
已知五个数:1,3,2,4,5,那么它们的[ ]
A、方差为4
B、方差为10
C、中位数为2
D、平均数为3