limit as x approaches 2 of 2x^2-7x+5

解答

x \to 2 lim (2 x^{2} - 7 x + 5)

- 1

求解步骤

x \to 2 lim (2 x^{2} - 7 x + 5)

代入值

x = 2

= 2 \cdot 2^{2} - 7 \cdot 2 + 5

化简

2 \cdot 2^{2} - 7 \cdot 2 + 5 : - 1

= - 1

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