1+ 1 is a joke.

One day, the teacher asked Xiao Ming: 1+ 1= Xiao Ming said: I don't know. The teacher said: Go home and ask your parents. So, Xiao Ming went home immediately after school. Xiao Ming asks his father first: Dad, 1+ 1= Several dads are chatting with friends. Xiao Ming suddenly interrupted him, and he blurted out: Roll Xiao Ming down and ask his sister: Sister, 1+ 1= Several sisters are playing mahjong. They didn't hear, so they said "20 thousand" Xiaoming wrote it down again. Finally, Xiao Ming asked his mother who was knitting and said "one more" the next day. The teacher asked Xiao Ming "1+ 1= how much" and "roll". The teacher slapped Xiao Ming. "1+ 1= how much" and "20000" always went bang. Xiao Ming slapped him, and before the teacher asked him, Xiao Ming blurted out "one more", hoping to adopt it.