python编制程序：有一分数序列：2,3/2,5/3,8/5,13/ 8,... ,输出其前30项并求和

# 初始化前两项
a = 2
b = 3
sum = a + b

# 输出前两项
print("1:", a)
print("2:", b)

# 循环输出后28项并求和
for i in range(3, 31):
c = a + b
a = b
b = c
sum += b / a
print(i, ":", b / a)

# 输出总和
print("sum:", sum)

相关问题

用Python编制程序：有一分数序列：2,3/2,5/3,8/5,13/8,...,输出其前30项并求和，请把代码填入框内。

a = 2
b = 3
sum = 2
print(a)
print(str(b) + "/" + str(a))

for i in range(2, 31):
c = a + b
sum += c / b
print(str(c) + "/" + str(b))
a = b
b = c

print("前30项之和为：" + str(sum))

编制程序：有一分数序列：2,3/2,5/3,8/5,13/8,...,输出其前30项并求和python

编写程序来输出并求和分数序列的前30项可以使用循环和分数运算的库。以下是一个示例程序：

from fractions import Fraction

def generate_fraction_sequence(n):
    sequence = [Fraction(2, 1)]
    a, b = 2, 1
    for _ in range(n-1):
        a, b = a + b, a
        sequence.append(Fraction(a, b))
    return sequence

def sum_fraction_sequence(sequence):
    total = sum(sequence)
    return total

# 输出前30项
sequence = generate_fraction_sequence(30)
for fraction in sequence:
    print(fraction)

# 求和
total = sum_fraction_sequence(sequence)
print("总和:", total)

这个程序使用`fractions`库中的`Fraction`类来处理分数。`generate_fraction_sequence`函数生成分数序列，`sum_fraction_sequence`函数计算序列的总和。最后，我们使用循环打印出前30项，并输出总和。