3-2答案有问题 ---- a='Hell' b='o Wor' c='ld' print(a+b+c)
a='Hello'
b=' '
c='World'
d='!'
print(a+b+c+d)
a="hello"
b=" world"
print(a+b)
hello = 'Hello'
space = ' '
world = 'World'
print(hello+space+world)
a='Hell'
b='o Wor'
c='ld'
print(a+b+c)