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Mathematics family
The meaning of "mandatory" in the text should be the first (? 3) species

Yang LAN

The author describes three things, which are expressed by equal, greater than and less than, so he calls his home "the home of mathematics".

A happy family of three, people are equal and harmonious, learn from each other and learn from each other's strengths.

Through three things, expressed by mathematical operation symbols, it has nothing to do with mathematics, so use quotation marks.

Happy home. Similar to the author, they learn from each other, are democratic and equal, and when something happens, three people sit together and try to analyze the reasons.