9*9乘法口诀

for a in range(1, 10):
    for b in range(1, a + 1):
        print(f"{a}*{b}={a*b}",end='\t')
    print()

a = 1
while a < 9:
    b = 1
    while b <= a:
        print(f"{a}*{b}={a*b}",end='\t')
        b += 1
    a += 1
    print()