论文部分内容阅读
我们知道,当自变量在全体实数范围内取值时,一次函数的图象是直线,二次函数的图象是抛物线,反比例函数的图象是双曲线.当自变量取值范围受到某种条件的限制时,函数图象则是其中的一部分了.请看以下三例.
We know that when the independent variable is in the range of all real numbers, the image of the first function is a straight line, the image of the quadratic function is a parabola, and the image of the inverse proportional function is a hyperbola. When the range of the independent variable is a certain value When the condition is limited, the function image is part of it. See the following three examples.