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Comparison of several grades of primary school mathematics in Beijing edition
The second volume of the sixth grade.

The second volume of the sixth grade. The seventh episode, Bibi's understanding. Let students know the characteristics of positive and negative proportion application problems. Understand and master the ideas and methods of solving problems by using proportional answers, and learn to correctly answer basic positive and negative proportional application questions.

Further cultivate students' ability to analyze and reason with knowledge and develop their thinking.