用python解决一下问题!大一基础的!

def fun1(a,b,c):
    return b*b-4*a*c>=0

# 1.
def isV(a, b, c):
    return b ** 2 - 4 * a * c >= 0

# 2.
def splitD(num): 
    n = 2
    l = []
    while num >1:
        if num % n == 0:
            num = num // n
            l.append(str(n))
        else:
            n += 1
    return '*'.join(l)

print(splitD(72))

# 3.
def Dec(n):
    l = list(map(lambda x: (int(x) + 5) % 10, list(str(n))))
    l[0], l[3] = l[3], l[0]
    l[1], l[2] = l[2], l[1]
    return l

print(Dec(1432))