import math
print (math.ceil(2.5))#向上取整
print (math.floor(2.5))#向下取整
print (round(2.5))#四舍五入
向上取整,向下取整,四舍五入
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import math
print (math.ceil(2.5))#向上取整
print (math.floor(2.5))#向下取整
print (round(2.5))#四舍五入
向上取整,向下取整,四舍五入