《python编程练习题》中的第二部分内容（19-36）和第三部分内容（37-54）

sweden_dove2026-01-22 10:15

1：计算下列多项式之和

python 复制代码

sum = 0
for i in range(1,101):
    sum = sum + 1/i
print(sum)

python 复制代码

PS E:\2026冬python>
5.187377517639621

python 复制代码

sum = 0
n = int(input("输入的数字："))
for i in range(1,n+1,2):
    sum = sum + 1/i
for i in range(2,n+1,2):
    sum = sum - 1/i
print("sum=%.6f"%sum)

python 复制代码

PS E:\2026冬python> 
输入的数字：10
sum=0.645635

python 复制代码

sum = 0
t = 0
n = int(input("输入的数字："))
for i in range(1,n+1):
    t += i
    sum += 1/t
print(sum)

python 复制代码

PS E:\2026冬python>
输入的数字：10
1.8181818181818181

python 复制代码

a = 2
sum = 0
for i in range(6):
    sum = sum + a
    a = a * 10 + 2
print(sum)

python 复制代码

PS E:\2026冬python>
246912

e=1+1/1!+ 1/2! +1/3!+......1/n!

python 复制代码

sum = 1
t = 1
i = 1
while 1 / t > 1e-6:
    t = t * i
    sum = sum + 1 / t
    i += 1
print("sum=%.6f" % sum)

python 复制代码

PS E:\2026冬python>
sum=2.718282

python 复制代码

pi = 1
t = 3
f = -1
while 1/t > 1e-6:
    pi = pi + f/t
    t = t + 2
    f = -f
print("pi=%.6f" % (pi*4))

python 复制代码

PS E:\2026冬python> 
pi=3.141591