print("正序九九乘法表:")
for a in range(1,10):
for b in range(1,a+1):
print(str(b)+"*"+str(a)+"="+str(a*b),end="\t")
print()#换行
print()#换行
print("逆序九九乘法表:")
for a in range(9,0,-1):
for b in range(a,0,-1):
print(str(b)+"*"+str(a)+"="+str(a*b),end="\t")
print()#换行