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对于分式函数y=(a1x2+b1x+c1)/(a2x2+b2x+c2)的值域的判断方法,我们常用的是判别式法,若自变量x有条件限制,则要转化为二次函数根的分布来解决,问题变得更加复杂难解。我们若能够活用
For the method of judging the value range of the fractional function y = (a1x2 + b1x + c1) / (a2x2 + b2x + c2), we usually use the discriminant method. If the conditional variable x is limited, The distribution of function roots to solve the problem becomes more complex and difficult to solve. If we can use it