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LIM (x - > - 8) [SQR (1-x) - 3] / [2 + cubic root x] What else can we do besides using the law of lobita?
The simple answers are as follows: 1) the molecule is rationalized; 2) the numerator and denominator are multiplied by [4 + 2 * cubic root x + cubic root (x ^ 2)]; 3) at this time, the numerator and denominator have (x + 8), and the limit will come out if it is eliminated. Note: 1. Step 1) 2) can be carried out at the same time; 2. The treatment method of the numerator and denominator is essentially the same, which is to eliminate
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