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现在许多题目都要我们求什么时候方程有两解,这其中的有两解应怎样理解呢?我们不妨先看一错例: 错例:当a为何值时,关于x的方程2lgx-lg(x-1)=lga有两解?(a>0)
Now many questions need us to ask when the equation has two solutions. How do we understand two equations? Let us first look at an example: Wrong case: When a is the value, the equation 2lgx-lg for x is X-1) = lga has two solutions? (a>0)