# 小案例，打印输出加法口诀
for i in range(1,10):for j in range(1,10):if j>i:breakprint(f"{j}+{i}={j+i}".strip(),end='\t')print()
print('\n')

for i in range(1,10):for j in range(1,10):if j>i:breakprint(f"{j}x{i}={j*i}",end='\t')print( )
print('\n')

for i in range(1,10):for j in range(1,10):if j>i:breakprint(f"{i}-{j}={i-j}",end='\t')print( )
print('\n')