limit as x approaches 4 of 4x^3-3x-5

解答

x \to 4 lim (4 x^{3} - 3 x - 5)

239

求解步骤

x \to 4 lim (4 x^{3} - 3 x - 5)

代入值

x = 4

= 4 \cdot 4^{3} - 3 \cdot 4 - 5

化简

4 \cdot 4^{3} - 3 \cdot 4 - 5 : 239

= 239

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