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被翻红浪 发表于 2018-3-19 09:06:58

a = 2
b = 1
result = 0
for i in range(20):
if i < 19:
print("{}/{}+".format(a, b), end='')
else:
print("{}/{} = ".format(a, b), end='')
result += a/b
temp = a
a = a + b
b = temp
print(round(result, 2))

大头目 发表于 2018-3-19 09:47:35

str1 = ''
float1 = 0

def fib(max):
global str1
global float1
n, a, b = 0, 1, 1
while n < max:
a, b = b, a + b
n = n + 1
if n < 20:
float1 += b/a
str1 += str(b) + '/' + str(a) + '+'
if n == 20:
float1 += b/a
str1 += str(b) + '/' + str(a) + ' = ' + '%0.2f' %float1 #str(float1)
yield b/a
return 'done'

g = fib(20)

while True:
try:
x = next(g)
#print('g:', x)
except StopIteration as e:
#print('Generator return value:', e.value)
break

print(str1) #现有程序改编，丑是丑了点，仅解本题用

grf1973 发表于 2018-3-19 10:33:59

fib=
fib,fib=1,2
s,ss=2,'2/1'
for k in range(2,21):
fib=fib+fib
ss+='+'+str(fib)+'/'+str(fib)
s+=fib/fib
print(ss+'=',round(s,2))

jerryxjr1220 发表于 2018-3-19 10:59:26

def feb(s1=1,s2=1):
while True:
yield s2
s1, s2 = s2, s1+s2
a, b = feb(), feb(1,2)
s = "+".join()
print(s,"=","%.2f"%eval(s))
2/1+3/2+5/3+8/5+13/8+21/13+34/21+55/34+89/55+144/89+233/144+377/233+610/377+987/610+1597/987+2584/1597+4181/2584+6765/4181+10946/6765+17711/10946 = 32.66

luokaoge 发表于 2018-3-19 11:03:56

本帖最后由 luokaoge 于 2018-3-19 11:05 编辑

x = 1
y = 1
a = ''
l = []
r = []
for i in range(1,21):
x , y = y , y + x
s = y/x
if i != 20:
a = str(y) + '/' + str(x) + '+'
else:
a = str(y) + '/' + str(x)
r.append(s)
l.append(a)
d = str(sum(r))
f = d[:5]
print("".join(l) + '=' + f)

lcfyujianwen 发表于 2018-3-19 13:25:51

def fun(n):
if n == 1:
return 1
elif n == 2:
return 2
else:
return (fun(n-1)+fun(n-2))

def summary(n):
sum = 0

for i in range(1, n+1):
sum += fun(i+1)/fun(i)
if i <= (n-1):
print (str(fun(i+1)) + '/' + str(fun(i)) + ' + ' , end = '')
else:
print (str(fun(i+1)) + '/' + str(fun(i)) + ' = ' , end = '')

print (('%.2f')%sum)

if __name__ == '__main__':

while True:
n = input('计算前n项的和（输入q退出计算）：')

if n.isdigit():
summary(int(n))
elif n == 'q':
break
else:
print("输入错误，请重新输入一个正整数")

qpwoeiruty 发表于 2018-3-19 13:33:47

def SumFibonacci(num=20):
i=3
feibo =
a=1
b=1
j = 30
while i<=j:
   c=a+b
   i=i+1
   feibo.append(c)
   a=b
   b=c

k=0
Result = 0
while k<=(num-1):
   Result = Result + feibo/feibo
   k=k+1
print ('Result='+('%.2f'%Result))

graceasyi 发表于 2018-3-19 13:40:37

本帖最后由 graceasyi 于 2018-3-19 13:41 编辑

def fib_itr(n):
if n < 0: return None
if n <= 1: return (0, 1)
a, b = 1, 1
for i in range(n-1):
a, b = b, a + b
yield a, b

sum = 0
str1 = ''
for i, j in fib_itr(21):
sum += j/i
str1 += str(j)+'/'+str(i)+'+'

print(str1[:-1], end='')
print("=%.2f" % sum)

结果：
2/1+3/2+5/3+8/5+13/8+21/13+34/21+55/34+89/55+144/89+233/144+377/233+610/377+987/610+1597/987+2584/1597+4181/2584+6765/4181+10946/6765+17711/10946=32.66

benzhj 发表于 2018-3-19 15:35:51

本帖最后由 benzhj 于 2018-3-19 15:49 编辑

den =
num =
i = 0
temp = 1
result = 0

for i in range(18):
den.append(den + den)
num.append(num + num)
temp +=1

for i in range(len(den)):
result += num/den

for i in range(19):
print("{0}/{1}".format(num, den), end = '+')

print("{0}/{1}={2}".format(num, den, (int(result*100)/100)))

得数到是对了，但存在问题是，列表生成式，还是不会。。。。
还有保留两个小数，这个。。。我的解决方法应该不是python的解决方法。
期待别人的答案。

晓屁屁 发表于 2018-3-19 15:46:58

写的很low~~~~

list1 =[]
list2 =[]
z =0
for i in range(22):
if i ==0 or i ==1:
   list1.append(1)
else:
   list1.append(list1+list1)
try:
for x in range(len(list1)):
   if x>1:
         list2.append((int(list1)/int(list1)))
except IndexError:
pass
try:
for y in range(len(list1)):
   z = float(list2) + z

except IndexError:
pass
try:
for a in range(len(list1)):
   b = list1
   print('%s/%s '%(str(list1),str(list1)),end='')
   if str(list1) != '17711':
         print(end='+ ')
   if str(list1) == '17711' :
         print(' =%.2f '%z)
   continue
except IndexError:
pass

FTT100 发表于 2018-3-19 16:22:37

本帖最后由 FTT100 于 2018-3-19 16:31 编辑

def fab(n) :
a,b,c=0,1,1
result = []
result.append(1)
while c < n :
   a,b = b,a+b
   result.append(b)
   c = c+1
return result

def listn(listn) :
a,b,c=0,0,1
pstr = ''
cnt=0
while c < len(listn)-1 :
   if len(pstr) == 0 :
         pstr=pstr+str(listn)+'/'+str(listn)
   else :
         pstr=pstr+'+'+str(listn)+'/'+str(listn)
   cnt=cnt+round(listn/listn,4)
   c = c+1
print(pstr+'=%0.2f'%(cnt))

rel = fab(22)

print(len(rel))
print(rel)
#rel=
listn(rel)

o41003121 发表于 2018-3-19 16:43:47

def fib(x):
if x == 1 or x == 2:
   return 1
else:
   return fib(x - 1) + fib (x - 2)

ssum = 0
sumstr = ''
for i in range(2,22):
ssum += fib(i + 1) / fib(i)
sumstr += str(fib(i+1))+'/'+str(fib(i))
if i != 21:
   sumstr += '+'
else:
   sumstr += '='

print(sumstr,'%.2f' % ssum)

idol 发表于 2018-3-19 16:49:59

listFib = []
listSum = []
def createFiblist(molecular, denominator, count):
if count > 0:
   listFib.append(r'%s/%s'%(molecular, denominator))
   listSum.append(molecular/denominator)
   createFiblist(molecular+denominator, molecular, count-1)
return

def calcFib(list1):
result = 0
for i in range((len(list1)-1)):
   print(list1 + '+', end=' ')
print(list1[-1]+ '=', end=' ')

for each in list1:
   result += each
return '%.2f' % result

def main():
molecular = 2
denominator = 1
count = 20

list1 = createFiblist(molecular, denominator, count)
result = calcFib(list1)
print(result)

if __name__ == '__main__':
main()

yjsx86 发表于 2018-3-19 16:55:54

def func(times):
a, b = 2, 1
string = '2/1'
while times>1:
   a, b = a+b, a
   string += '+%d/%d' % (a,b)
   times -= 1
print('%s = %.2f' % (string,eval(string)))

func(20)

#结果
2/1+3/2+5/3+8/5+13/8+21/13+34/21+55/34+89/55+144/89+233/144+377/233+610/377+987/610+1597/987+2584/1597+4181/2584+6765/4181+10946/6765+17711/10946 = 32.66

o41003121 发表于 2018-3-19 19:24:10

ssum = 0
sumstr = ''
alist =
for i in range(1,21):
alist.append(alist+alist)
ssum += alist / alist
sumstr += str(alist)+'/'+str(alist)
if i != 20:
sumstr += '+'
else:
sumstr += '='

print(sumstr,'%.2f' % ssum)

不用递归

wyp02033 发表于 2018-3-19 19:34:25

def fab(n):
if n == 1:
   return 1
elif n == 2:
   return 2
else:
   return fab(n-1) + fab(n-2)

def main():
sum_ = 0
result = ''
for i in range(1, 21):
   sum_ += fab(i+1) / fab(i)
   result += (str(fab(i+1)) + "/" + str(fab(i)) + '+')
print(result[:-1] + "=%.2f"%(sum_))

if __name__ == '__main__':
main()

result:2/1+3/2+5/3+8/5+13/8+21/13+34/21+55/34+89/55+144/89+233/144+377/233+610/377+987/610+1597/987+2584/1597+4181/2584+6765/4181+10946/6765+17711/10946=32.66

冬雪雪冬 发表于 2018-3-19 21:28:47

评分截至标记。

CH10 发表于 2018-3-19 21:46:25

def fibonacci(num):
a, b, result = 1, 1, 0
x, y = 0, 1
temp = ''
for i in range(num):
   temp += str(a+b)+'/'+str(x+y)
   if(i<num-1):
         temp += '+'
   result += (a+b)/(x+y)
   c, z = a, x
   a, x = b, y
   b = c+b
   y = z+y
temp += ('=' + str(round(result, 2)))
return temp
print(fibonacci(20))
2/1+3/2+5/3+8/5+13/8+21/13+34/21+55/34+89/55+144/89+233/144+377/233+610/377+987/610+1597/987+2584/1597+4181/2584+6765/4181+10946/6765+17711/10946=32.66

wyf345491656 发表于 2018-3-20 20:28:31

inverseli 发表于 2018-3-18 19:12

缺第一项

inverseli 发表于 2018-3-20 22:15:50

wyf345491656 发表于 2018-3-20 20:28
缺第一项

第一项在上边，就是result哪里

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