y=（x²-x+1）÷(x²-2x-3)的图像怎么画
问题描述：
y=（x²-x+1）÷(x²-2x-3)的图像怎么画
答
y=(x^2-x+1)/(x^2-2x-3) = 1 -3/4*1/(x+1) + 7/4*1/(x-3)可以看成三条曲线：y1 = 1y2 = -3/4*1/(x+1)y3 = 7/4*1/(x-3)将这三条曲线叠加即可....