\(lim\frac{1+2\cdot3^n-7^n}{5^n+2\cdot7^n}\)
\(=lim\frac{\frac{1}{7^n}+\frac{6^n}{7^n}-1}{\frac{5^n}{7^n}+\frac{14^n}{7^n}}\)
\(=lim\frac{0+\left(\frac{6}{7}\right)^n-1}{\left(\frac{5}{7}\right)^n+2}=\frac{-1}{2}\)
\(lim\frac{1+2\cdot3^n-7^n}{5^n+2\cdot7^n}\)
\(=lim\frac{\frac{1}{7^n}+\frac{6^n}{7^n}-1}{\frac{5^n}{7^n}+\frac{14^n}{7^n}}\)
\(=lim\frac{0+\left(\frac{6}{7}\right)^n-1}{\left(\frac{5}{7}\right)^n+2}=\frac{-1}{2}\)
\(lim\frac{4^{n-1}+6^{n+2}}{5^n+2.7^n}\)
Tính lim \(\dfrac{5^n+2.3^n}{4.5^n+1}\)
1.lim(\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+....+\frac{1}{n\left(n+1\right)}\))
2.Tìm tất cả các giá trị của a sao cho lim\(\frac{4^n+a.5^n}{\left(2a-1\right).5^n+2^n}\)=1
3. Cho \(a\in R\)và lim(\(\sqrt{n^2+an+4}-n+1=5\)).Tìm a
4.Cho\(Lim_{(x->2)}f\left(x\right)=5\). Tìm giới hạn \(lim_{\left(x->2\right)}\sqrt{[f\left(x\right)-3]x}\)
\(lim\left(1+\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{n\left(n+1\right)}\right)=?\)
cần gấp nhé !!!!
1/ lim \(\dfrac{\sqrt{n^4-n^2}+3n^2}{1-n^2}\)
2/ lim \(\dfrac{n\sqrt{n}-n^3}{4n^3+\sqrt{n}}\)
3/ lim \(\dfrac{3.4^n-1}{2.3^n+4}\)
4/ lim \(\dfrac{2^{n+1}+4.3^{n-1}}{1-2^{n-1}+3^{n+1}}\)
tính lim của lim\(\frac{4n^5-n+1}{\left(2n+1\right)\left(-n+1\right)\left(n^2+2\right)}\)
1) tính \(\lim\limits_{n\rightarrow\infty}\dfrac{3n^5+3n^3-1}{n^3-2n}\)
2) tính \(\lim\limits_{n\rightarrow\infty}\dfrac{3n^7+3n^5-n}{3n^2-2n}\)
1) tính \(\lim\limits_{n\rightarrow\infty}\dfrac{-6n^5+3n^3-1}{n^4-8n}\)
2) tính \(\lim\limits_{n\rightarrow\infty}\dfrac{-5n^7+8n^5-n}{5n^6-2n}\)
`lim(50 xx frac{1 - (4/5)^{n}}{1 - 4/5} + 4/5 xx 50 xx frac{1- (4/5)^{n-1}}{1 - 4/5})`