limit as x approaches 2 of (2x-6)/(x-1)

解答

x \to 2 lim (\frac{2 x - 6}{x - 1})

- 2

求解步骤

x \to 2 lim (\frac{2 x - 6}{x - 1})

代入值

x = 2

= \frac{2 \cdot 2 - 6}{2 - 1}

化简

\frac{2 \cdot 2 - 6}{2 - 1} : - 2

= - 2

x \to 9 - lim (\frac{5 x}{x - 9})

\frac{d}{d x} (- 4 x^{4} + 8 x^{3})

in v erse l a pl a ce \frac{( 3 s + 1 )}{s ( s + 2 )}

y^{^{'}} - \frac{6}{x} y = \frac{( y ^{5} )}{x ^{18}}, y (1) = 1

d er i v a t i v e g (x) = 3 (5 - 7 x)^{5}