1,使用Python解决数学问题。
ABCD乘9 = DBCA 那么 A=?,B=?,C? D=?
for A in range(1,10):
for B in range(0,10):
for C in range(0,10):
for D in range(1,10):
if (A*1000 + B * 100 + C * 10 +D)* 9 == (D*1000 + C*100 +B*10 + A):
print(‘{0}{1}{2}{3}*9 == {3}{2}{1}{0}‘.format(A,B,C,D))
2,使用python求阶乘的和。
0!+1!+2!+3!+4!+....+n!
def fact(n):
if n == 0:
return 1
return n * fact(n-1)
while True:
result = 0
n = input(‘Please input number:‘)
if not n.isdigit():
print(‘你输入的不是纯数字，请重新输入！‘)
continue
for i in range(0,int(n)+1):
result+=fact(i)
print(result)
