进一步依据情境理论指出几何教材应注重通过构筑系统的问题情境将几何内容由直观过渡到抽象。
According to the scene Theory, geometry teaching materials should pay attention to how we can transform the content from intuition to abstract by constructing the systematic problem scene.
数学是一门抽象性很强的学科。在数学教材和课堂教学中体现直观性，是各国都努力追求的。
Mathematics is an abstract subject to be learned and the visualizability of both maths teaching materials and classroom teaching is an aim to be pursued in every country.
在一般教材中二重积分变量代换公式的证明通常采用几何的方法，也有部分数学分析教材给与了严格的分析证明，但证明不便直观的几何说明。
With proper method of variable substitution, the soluble method to two kinds of inegrable equation of Riccati form is found, and the general integral expressions are given.
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