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What knowledge points did Yiwu, Jinhua, Zhejiang, junior high school math, grade one, grade two and grade three hand in respectively?
Algebra is rational number, irrational number function, quadratic inverse ratio.

Geometrically, it is a triangle congruent (key) parallelogram, and a triangle is similar to a trigonometric function circle.

This is basically the point.

The problem is the combination of similar triangles and quadratic function.

Other small knowledge points, such as probability statistics, are very simple.