计算：6{9])Q.N'M1E5K
123+234+345-456+567-678+789-8906{9])Q.N'M1E5K
算式：提示(@2|/}6\-~4l6{9])Q.N'M1E5K
=39l;{(?1J+f+W0V6{9])Q.N'M1E5K