The number of zeros of function f (x) = (x-1) (x + 2) lgx △ x-3 is

There are three ways to find the zero point: 1. Draw the function image; 2. Analyze the zero point interval; 3. Decompose the image. This problem is applicable to method 2. Take 0.1, the function value is 15.9. When x takes 1, f (x) = - 3, take 10, f (x) = 7.8, take 100, the position is 198.96

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