giúp mìnk zới pls :<
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
MA
5
NN
1
10 tháng 12 2021
Bài 51:
a: \(\Leftrightarrow a+1\in\left\{1;-1;2;-2\right\}\)
hay \(a\in\left\{0;-2;1;-3\right\}\)
BB
1
27 tháng 6 2021
`d)sqrt{7-2sqrt{10}}-sqrt{7+2sqrt{10}}`
`=sqrt{5-2sqrt{5}.sqrt2+2}-sqrt{5+2sqrt{5}.sqrt2+2}`
`=sqrt{(sqrt5-sqrt2)^2}-sqrt{(sqrt5+sqrt2)^2}`
`=sqrt5-sqrt2-sqrt5-sqrt2=-2sqrt2`
27 tháng 6 2021
d, \(\sqrt{7-2\sqrt{10}}-\sqrt{7+2\sqrt{10}}=\sqrt{5-2.\sqrt{2}.\sqrt{5}+2}-\sqrt{5+2.\sqrt{2}.\sqrt{5}+2}\)
\(=\sqrt{\left(\sqrt{5}-\sqrt{2}\right)^2}-\sqrt{\left(\sqrt{5}+\sqrt{2}\right)^2}=\left|\sqrt{5}-\sqrt{2}\right|-\left|\sqrt{5}+\sqrt{2}\right|\)
\(=\sqrt{5}-\sqrt{2}-\sqrt{5}-\sqrt{2}=-2\sqrt{2}\)
NP
0
A
5
15 tháng 3 2018
All of the special holidays in my country, I Tet the most. Tet is an occasion to everyone get together in warm atmosphere. Before Tet holiday, Everyone prepares many things and decorates their house. I plant a lot of flowers in front of my house and buy many things such as clothes, foods ...
Besides, most of the streets also are decorated beautifully with colorful lights and flowers. During Tet, I spends more time on visiting my relatives, friends and colleagues. Especially, I give to each other the best wishes for the new year. Tet is an opportunity for children receive lucky money. There is a funny thing that people try to avoid argument or saying any bad things at Tet. I love Tet holiday!
27 tháng 11 2017
bạn nguyễn đình toàn ơi bạn có thể giải cụ thể ra giúp mìnk đc k
1. was repaired
2.follow
3.are/live
4.has become
5.did you do