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What knowledge should be selected in the open class of mathematics in the fourth grade of Jiangsu Education Press?
Collocation rule and understanding triangle.

1, Collocation Law is a course to find hidden laws from common life phenomena. It is not difficult to find this rule. The key is to let students know that these phenomena in real life should be observed from a mathematical point of view, which is suitable for grade four.

2. "Understanding Triangle" is about students' understanding of triangles and their characteristics through hands-on operation and observation, which is suitable for the fourth-grade mathematics open class of Jiangsu Education Press.

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