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Why should Shandong Education Press learn congruence twice in mathematics?
The reason for this is the following:

1 and congruence are very important concepts in mathematics, which involve the position relationship and size relationship between graphs. It can help students better understand the nature and characteristics of graphics.

2. Repeated study of congruence can deepen students' mastery and understanding of knowledge.

3. Repeated learning of congruence is helpful to improve students' mathematical thinking ability and problem-solving ability.