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import math
math.sqrt( x )

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import math #瀵煎叆math妯″潡
print "math.sqrt(100) : ", math.sqrt(100)
print "math.sqrt(7) : ", math.sqrt(7)
print "math.sqrt(math.pi) : ", math.sqrt(math.pi)

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math.sqrt(100) : 10.0
math.sqrt(7) : 2.64575131106
math.sqrt(math.pi) : 1.77245385091