你的问题应该是print后面的:
#正确的代码
for i in range(1,10):
for j in range(1,i+1):
print(str(j)+"x"+str(i)+"="+str(i*j)+"\t",end="")
print("")
#用print(f"{变量}")
for i in range(1,10):
for j in range(1,i+1):
print(f"{j}X{i}={i*j}\t",end="")
print("")