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这个符号写错了。[ ] 改为{ }
from random import *
a=randint(1,100)
b=randint(1,100)
c=randint(1,100)
print("a =",a)
print("b =",b)
print("c =",c)
for i in range(min(a,b,c),0,-1):
if a%i==0 and b%i==0 and c%i==0:
print("{}和{}和{}的最大公约数为:{}".format(a,b,c,i))
break
for s in range(max(a,b,c),a*b*c+2):
if s%a==0 and s%b==0 and s%c==0:
print("{}和{}和{}的最小公倍数为:{}".format(a,b,c,s))
break