n = int(input('請輸入項數: '))
fenzi = 2#分子
fenmu = 1#分母
l = []
s = 0
for i in range(1,n+1):
a = fenzi
b = fenmu
s += (a/b)
l.append('%s/%s'%(a,b))
fenzi = a+b
fenmu = a
print('+'.join(str(i) for i in l),end = '')
print('=%.2f'%s)
n = int(input('請輸入項數: '))
fenzi = 2#分子
fenmu = 1#分母
l = []
s = 0
for i in range(1,n+1):
a = fenzi
b = fenmu
s += (a/b)
l.append('%s/%s'%(a,b))
fenzi = a+b
fenmu = a
print('+'.join(str(i) for i in l),end = '')
print('=%.2f'%s)
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