论文部分内容阅读
一、一次函数图象与不等式解集例1(2013年·娄底)一次函数y=kx+b(k≠0)的图象如图1所示.当y>0时,x的取值范同是().A.x<0 B.x>0C.x<2 D.x>2解析:根据一次函数图象与x轴交点的坐标,以及图象被x轴所截的两部分相对于x轴的位置关系,可直接得出答案是x<2.选C.解后反思:已知一次函数图象与两条坐标轴的交点坐标,确定函数值大于某个数(或小于某个数,
First, a function of the image and inequality set Example 1 (Loudi in 2013) a linear function y = kx + b (k ≠ 0) image shown in Figure 1. When y> 0, the value of x Same as () .Ax <0 Bx> 0C.x <2 Dx> 2 Resolution: Based on the coordinates of the primary function image intersected with the x-axis and the positional relationship of the two parts of the image with respect to the x-axis , You can directly draw the answer is x <2. Select C. Reflections after solution: Known once function image coordinates of the two axes of coordinates, to determine the value of the function is greater than a certain number (or less than a certain number,