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DN
27 tháng 3 2022
Five years ago, I attended a very big festival in Ha Noi. It’s called 1000th Anniversary of Thang Long – Ha Noi Festival. There are a lot of activities in this festival such as fireworks display, military parade, music performances, ect. It was organized very splendidly because the organizers are the Viet Nam government. Millions of people came to Ha Noi to participate in this great festival. It was held for ten days from October 1st 2015 to October 10th 2015. I saw lots of fireworks, parties, parades during these days. It was interesting. I took so many pictures on this festival because there were plenty of beautiful scenes. We organized this great festival to celebrate the 1000th anniversary of Thang Long – Ha Noi.
5 tháng 1 2022
\(\text{Bài 1:a)}25\dfrac{3}{19}.\left(-\dfrac{4}{5}\right)-35\dfrac{3}{19}.\left(-\dfrac{4}{5}\right)\)
\(=\dfrac{478}{19}.\left(-\dfrac{4}{5}\right)-\dfrac{668}{19}.\left(-\dfrac{4}{5}\right)\)
\(=\left(-\dfrac{4}{5}\right).\left(\dfrac{478}{19}-\dfrac{668}{19}\right)\)
\(=\left(-\dfrac{4}{5}\right).\left(\dfrac{-190}{19}\right)\)
\(=\left(-\dfrac{4}{5}\right).\left(-10\right)=8\)
\(\text{b)}5:\left(-\dfrac{5}{2}\right)^2+\dfrac{2}{15}.\sqrt{\dfrac{9}{4}}-\left(-2021\right)^0+0,25\)
\(=5:\dfrac{25}{4}+\dfrac{2}{15}.\dfrac{3}{2}-1+\dfrac{1}{4}\)
\(=\dfrac{4}{5}+\dfrac{1}{5}-1+\dfrac{1}{4}\)
\(=1-1+\dfrac{1}{4}\)
\(=0+\dfrac{1}{4}=\dfrac{1}{4}\)
\(\text{Bài 2:a)}\dfrac{8}{5}-\dfrac{3}{5}:x=0,4\)
\(\dfrac{3}{5}:x=\dfrac{8}{5}-0,4=\dfrac{6}{5}\)
\(x=\dfrac{3}{5}.\dfrac{5}{6}=\dfrac{1}{2}\)
\(\text{b)}\left(3x-\dfrac{1}{2}\right)^2+\dfrac{21}{25}=1\)
\(\left(3x-\dfrac{1}{2}\right)^2\) \(=1-\dfrac{21}{25}=\dfrac{4}{25}=\pm\left(\dfrac{2}{5}\right)^2\)
\(\text{Vậy }3x-\dfrac{1}{2}=\dfrac{2}{5}\)
\(3x\) \(=\dfrac{2}{5}+\dfrac{1}{2}=\dfrac{9}{10}\)
\(x\) \(=\dfrac{9}{10}.\dfrac{1}{3}=\dfrac{3}{10}\)
\(\text{hoặc }3x-\dfrac{1}{2}=\dfrac{-2}{5}\)
\(3x\) \(=\left(\dfrac{-2}{5}\right)+\dfrac{1}{2}=\dfrac{1}{10}\)
\(x\) \(=\dfrac{1}{10}.\dfrac{1}{3}=\dfrac{1}{30}\)
\(\Rightarrow x\in\left\{\dfrac{3}{10};\dfrac{1}{30}\right\}\)
5 tháng 1 2022
Bài 2:
a: =>3/5:x=6/5
hay x=3/5:6/5=1/2
b: \(\Leftrightarrow\left(3x-\dfrac{1}{2}\right)^2=\dfrac{4}{5}\)
\(\Leftrightarrow\left[{}\begin{matrix}3x-\dfrac{1}{2}=\dfrac{2}{5}\\3x-\dfrac{1}{2}=-\dfrac{2}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{10}\\x=\dfrac{1}{30}\end{matrix}\right.\)
DT
8 tháng 2 2022
Harry Potter is one of my favourite movies. I have loved it since it was held in the theatre years ago. Based on the best seller fiction written by JK.Rowling, the movie makes it real. This movie was about Harry Potter, he is a wizard born in the dark days of the wizardry world. His parents died in the hand of Voldemort, the dark lord. During his journey, he experienced a lot: happiness, sadness, live and death moments, etc. At last, he finally beat Voldermort and became a great auror like his parents. This movie taught me many things. The most important thing for me is that love and friendship will always be there for those who deserve it and fight for it. I’d recommend this movie for everyone.
16 tháng 2 2019
link trả lời : Câu hỏi của Nguyễn Khánh Ngân - Tiếng Anh lớp 6 - Học toán với OnlineMath
5 tháng 1 2022
Bài 4:
a: Xét ΔABI và ΔACI có
AB=AC
AI chung
BI=CI
Do đó: ΔABI=ΔACI
b: Xét tứ giác ABDC có
I là trung điểm của BC
I là trung điểm của AD
Do đó: ABDC là hình bình hành
Suy ra: AB=CD
I think ... school is fantastic in order to learn English and make friends ... A very nice place to study, engage in extra class activities and make friends all over the world!