目录:
ABS(-1.5)等于1.5
ABS(0)等于0
ABS(2.5)等于2.5
ROUND(2.15,0)等于2
ROUND(2.149,1)等于2.1
ROUND(-1.475,2)等于-1.48
INT(4.8)等于4
INT(-4.8)等于-5
INT(4.3)等于4