求讨论点.ax-1/x=0 ,aX^2=1
x^2=1/a
x=根号a/a x2=-根a/a (a>0),这样把数轴分了3段,分段讨论如下:
当X>G(a)/a
ax-1/x>a ,即 ax^2-ax-1>0 x>(a+g(a^2+4a))/2a 或X
求讨论点.ax-1/x=0 ,aX^2=1
x^2=1/a
x=根号a/a x2=-根a/a (a>0),这样把数轴分了3段,分段讨论如下:
当X>G(a)/a
ax-1/x>a ,即 ax^2-ax-1>0 x>(a+g(a^2+4a))/2a 或X