例 1
可见,直线 l 和圆 C 是相交的,交点为 (2,0) 和 (1,3).
Mathematica 代码:
ContourPlot[{3 x + y – 6 == 0, x^2 + y^2 – 2 y – 4 == 0}, {x, -7,
7}, {y, -7, 7},
Axes -> 1, GridLines -> Range[-7, {7, 7}]]
Solve[{3 x + y – 6 == 0, x^2 + y^2 – 2 y – 4 == 0}, {x, y}]
例 2
可见,两个圆是相交的,交点为 (-1,1) 和 (3,-1).
Mathematica 代码:
ContourPlot[{x^2 + y^2 + 2 x + 8 y – 8 == 0,
x^2 + y^2 – 4 x – 4 y – 2 == 0},
{x, -9, 9}, {y, -9, 9}, Axes -> 1, GridLines -> Range[-9, {9, 9}]]
Solve[{x^2 + y^2 + 2 x + 8 y – 8 == 0, x^2 + y^2 – 4 x – 4 y – 2 == 0}, {x, y}]
发布者:Cara,转载请注明出处:http://www.makercollider.com/course/1834