Python题目，用表达式运行，怎么解决

帮忙看看怎么整计算机表达式运行出来

# 第二题
S = 0
n = 50
for i in range(1,n+1):
    total = 1
    for j in range(1,i+1):
        total *=j
    S += 1/total
print(S)

import math
# 第一题
S = 0
n = 20
for i in range(n+1):
    total = 0
    for j in range(i+1):
        total += math.sqrt(j)
    S += total
print(S)  

import math
# 第三题
S = 1
n = 10
x = 0.3
for i in range(1,n+1):
    total = 1
    for j in range(1,i+1):  #阶乘
        total *=j
    S += math.pow(x,i)/total
print(S)