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PT
1
NV
Nguyễn Việt Lâm
Giáo viên
9 tháng 3 2022
\(\lim\dfrac{3^n+2.6^n}{6^{n-1}+5.4^n}=\lim\dfrac{6^n\left[\left(\dfrac{3}{6}\right)^n+2\right]}{6^n\left[\dfrac{1}{6}+5\left(\dfrac{4}{6}\right)^n\right]}=\lim\dfrac{\left(\dfrac{3}{6}\right)^n+2}{\dfrac{1}{6}+5\left(\dfrac{4}{6}\right)^n}=\dfrac{0+2}{\dfrac{1}{6}+0}=12\)
\(\lim\left(\sqrt{n^2+9}-n\right)=\lim\dfrac{\left(\sqrt{n^2+9}-n\right)\left(\sqrt{n^2+9}+n\right)}{\sqrt{n^2+9}+n}=\lim\dfrac{9}{\sqrt{n^2+9}+n}\)
\(=\lim\dfrac{n\left(\dfrac{9}{n}\right)}{n\left(\sqrt{1+\dfrac{9}{n^2}}+1\right)}=\lim\dfrac{\dfrac{9}{n}}{\sqrt{1+\dfrac{9}{n^2}}+1}=\dfrac{0}{1+1}=0\)
\(\lim\dfrac{\sqrt{15+9n^2}-3}{5-n}=\lim\dfrac{n\sqrt{\dfrac{15}{n^2}+9}-3}{5-n}=\lim\dfrac{n\left(\sqrt{\dfrac{15}{n^2}+9}-\dfrac{3}{n}\right)}{n\left(\dfrac{5}{n}-1\right)}\)
\(=\lim\dfrac{\sqrt{\dfrac{15}{n^2}+9}-\dfrac{3}{n}}{\dfrac{5}{n}-1}=\dfrac{\sqrt{9}-0}{0-1}=-3\)
DT
Đỗ Thanh Hải
CTVVIP
25 tháng 9 2021
Ex1
1 usually walks
2 does - usually get
3 rarely washes
4 Do - often visit
5 isn't often
6 usually walks
7 is occasionally
8 am hardly
9 are always
10 often washes
Ex2
1 are working
3 are making
3 is having
4 is reading
5 is studying
6 am studying
7 is having
8 aren't studying
9 is having
10 are making
27 tháng 9 2021
Bài 1:
a: \(A=\left\{2\right\}\)
b: \(B=\left\{0;4;5\right\}\)
21 tháng 12 2021
3.Have you finished your homework yet?
5.I have never donated blood before
tớ biết mỗi 2 câu này thôi
went
do - sleep
will - do
won't celebrate
stays
do - sit
does - earn
didn't watch
were
stood
buy
did - meet
reads
went
do - sleep
will - do
won't celebrate
stays
do - sit
does - earn
didn't watch
were
stood
buy
did - meet
reads