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坐标系的建立,使数形结合成为现实.一方面我们可以“就数论形”,另一方面也可以“以形释数”,这两方面是形与数的对立统一,也正是解析几何的精髓. 关于求两曲线的交点,在直角坐标系中,由于点p和有序实数对(x,y)建立了一一对应的关系,那么只要联立二曲线的直角坐标方程,并将该方程组解出:如果有解,则二曲线有交点,交点坐标即方程组的解;如果无解,则二曲线无
The establishment of the coordinate system makes the combination of numbers and forms a reality. On the one hand, we can “count the number form” and on the other hand we can “interpret the numbers”. These two aspects are the opposite unity of form and number. It is also analytical geometry. The quintessence of the two curves. In the Cartesian coordinate system, since the point p and the ordered real number pair (x, y) establish a one-to-one correspondence, so long as the two-curve Cartesian coordinate equation is established, and The equations are solved: if there are solutions, the two curves have intersections, and the coordinates of the intersection point are the solutions of the equation group; if there is no solution, the two curves have no