1.判断下列各式是否正确:
(1)两个重要极限是指 ,
(2)
(3)
2.求下列极限:
(1)
(4) Y99myZvvIO0Y5PqctKp5Zg+MdOz5p9bG8Fob1Jp3GAwTm3o49eXvSKyrVfN9aZMX