Giúp em bài này với ạ!
Tìm các giới hạn sau:
a) \(\lim\limits_{x\to 1+} \dfrac{\sqrt{x}+\sqrt{x-1}-1}{\sqrt{x^2-1}}\)
b) \(\lim\limits_{x\to 1} \dfrac{x^n-1}{x^m-1}\) (m,n nguyên dương)
c) \(\lim\limits_{x\to 1} \dfrac{x+x^2+...+x^n-n}{x-1}\) (n nguyên dương)
Em cảm ơn rất nhiều!
Tính giới hạn :
\(\lim\limits_{x\rightarrow1}\dfrac{x^{n-1}-\left(n+1\right)x+n}{\left(x-1\right)^2}\)
Tính các giới hạn sau:\(I_1=\lim\limits_{x\rightarrow1}\dfrac{\left(1-\sqrt{x}\right)\left(1-\sqrt[3]{x}\right)....\left(1-\sqrt[n]{x}\right)}{\left(1-x\right)^{n-1}}\)
\(I_2=\lim\limits_{x\rightarrow0}\dfrac{\left(\sqrt{1+x^2}+x\right)^n-\left(\sqrt{1+x^2}-x\right)^n}{x}\)
a; \(\lim\limits_{x\rightarrow-1}\dfrac{x^5+1}{x^3+1}\)
b; \(\lim\limits_{x\rightarrow a}\dfrac{x^n-a^n}{x-a}\)
c; \(\lim\limits_{x\rightarrow1}\dfrac{x+x^2+.............+x^n-n}{x-1}\)
d; \(\lim\limits_{x\rightarrow1}\dfrac{x^{100}-2x+1}{x^{50}-2x+1}\)
\(\lim\limits_{x\rightarrow1}\left(\dfrac{n}{1-x^n}-\dfrac{1}{1-x}\right)\)
Tính \(\lim\limits_{x\rightarrow1}\left(\dfrac{n}{1-x^n}-\dfrac{1}{1-x}\right)\)
Bài 1
a. \(\lim\limits_{x\rightarrow-1}\frac{x^5+1}{x^3+1}\)
b. \(\lim\limits_{x\rightarrow1}\frac{x^6-5x^5+x}{\left(1-x\right)^2}\)
c. \(\lim\limits_{x\rightarrow0}\frac{\left(1+x\right)\left(1+2x\right)\left(1+3x\right)-1}{x}\)
d. \(\lim\limits_{x\rightarrow0}\frac{\left(1+x\right)^5-\left(1+x\right)}{x^5+x^2}\)
Bài 2
a. \(\lim\limits_{x\rightarrow1}\frac{x^m-1}{x^n-1}\)
b. \(\lim\limits_{x\rightarrow a}\frac{x-a}{x^n-a^n}\left(n\in Z^+,a\ne0\right)\)
c. \(\lim\limits_{x\rightarrow0}\frac{x+x^2+...+x^n-n}{x-1}\)
d. \(\lim\limits_{x\rightarrow0}\frac{\left(1+x\right)\left(1+2x\right)...\left(1+nx\right)-1}{x}\)
Tính các giới hạn sau:\(M=\lim\limits_{x\rightarrow0}\dfrac{\sqrt{1+4x}-\sqrt[3]{1+6x}}{1-cos3x}\)
\(N=\lim\limits_{X\rightarrow0}\dfrac{\sqrt[m]{1+ax}-\sqrt[n]{1+bx}}{\sqrt{1+x}-1}\)
\(V=\lim\limits_{x\rightarrow0}\dfrac{\left(1+mx\right)^n-\left(1+nx\right)^m}{\sqrt{1+2x}-\sqrt[3]{1+3x}}\)
\(\lim\limits_{x\rightarrow1}\dfrac{x+x^2+...+x^n-n}{x-1}\)
Tính giới hạn :
\(\lim\limits_{x\rightarrow1}\dfrac{x^n-nx+n-1}{\left(x-1\right)^2}\)