用while和do-while循环计算1*1+2*3+3*5+…+n*(2*n-1)的前50项结果。

使用while循环：

n = 1
count = 0
while count < 50:
    result = n * (2*n-1)
    print(result, end=' ')
    n += 1
    count += 1

使用do-while循环：

n = 1
count = 0
while True:
    result = n * (2*n-1)
    print(result, end=' ')
    n += 1
    count += 1
    if count >= 50:
        break