数学的研究对象是数和形，数寓于形中，形又和谐地体现了数量关系。它们互相依存，互相制约，相得益彰。数和形的结合是解数学题的基本途径之一，历来都倍受青睐。 数形结合体现在解题中就是许多代数问题可以用几何方法来解答；许多几何问题也可以用代数方法来求解。一般地说， The research object of mathematics is the number and shape, the number is dwelling in the shape, and the shape reflects the quantitative relationship harmoniously. They depend on each other, restrict each other and complement each other. The combination of number and shape is one of the basic ways to solve mathematics problems and has always been favored. The combination of number and shape is reflected in the solution of the problem that many algebraic problems can be solved by geometric methods; many geometric problems can also be solved by algebraic methods. In general,