把1.050进行修约,当修约间隔为0.1时,修约值为1.0
把0.35进行修约,当修约间隔为0.1时,修约值为0.3
把0.325进行修约,当把它修约成两位有效位数时,修约值为0.033
把-355进行修约,当把它修约到“十”数位时,修约值为-36×10