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Q: Korean [Ethnic Publishing House], Volume 1, Volume 2, Answers to after-school questions.
I don't want to check it myself. Come on, I'm sure you will. The fourth issue of "Understanding the World" in the sixth grade mathematics volume (Qingdao Edition).

Sixth Grade Mathematics Volume (Qingdao Edition) Sixth Grade Mathematics Phase IV (Qingdao Edition) Sixth Grade Mathematics Phase IV (Qingdao Edition) Sixth Grade Mathematics Phase IV (Qingdao Edition)