输出 9*9 乘法口诀表

法一：
for i in range(10):
    for j in range(1,i+1):
        print(i,"*",j,"=",i*j,end="\t")
    print()

法二：
i = 1
while i < 10:
    j = 1
    while j < i+1:
        print(i,"*",j,"=",i*j,end="\t")
        j += 1
    print()
    i += 1