giúp mik nhanh nhá mik cần gấp
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NT
9
23 tháng 8 2021
29: Ta có: \(\dfrac{1}{\sqrt{7}+\sqrt{5}}+\dfrac{2}{1-\sqrt{7}}\)
\(=\dfrac{\sqrt{7}-\sqrt{5}}{2}-\dfrac{2\sqrt{7}-2}{6}\)
\(=\dfrac{3\sqrt{7}-3\sqrt{5}-2\sqrt{7}+2}{6}\)
\(=\dfrac{-3\sqrt{5}-2}{6}\)
30: Ta có: \(\dfrac{4}{1-\sqrt{3}}+\dfrac{\sqrt{3}-1}{\sqrt{3}+1}\)
\(=\dfrac{-4\sqrt{3}-4}{2}+\dfrac{4-2\sqrt{3}}{2}\)
\(=\dfrac{-4\sqrt{3}-4+4-2\sqrt{3}}{2}=-3\sqrt{3}\)
31: Ta có: \(\dfrac{1}{\sqrt{2}-\sqrt{3}}-\dfrac{3}{\sqrt{18}+2\sqrt{3}}\)
\(=-\sqrt{3}-\sqrt{2}-\dfrac{3}{3\sqrt{2}+2\sqrt{3}}\)
\(=-\sqrt{3}-\sqrt{2}-\dfrac{9\sqrt{2}-6\sqrt{3}}{6}\)
\(=\dfrac{-6\sqrt{3}-6\sqrt{2}-9\sqrt{2}+6\sqrt{3}}{6}=\dfrac{-15\sqrt{2}}{6}\)
\(=\dfrac{-5\sqrt{2}}{2}\)
AH
Akai Haruma
Giáo viên
23 tháng 8 2021
29.
\(=\frac{\sqrt{7}-\sqrt{5}}{(\sqrt{7}-\sqrt{5})(\sqrt{7}+\sqrt{5})}+\frac{2(1+\sqrt{7})}{(1-\sqrt{7})(1+\sqrt{7})}\)
\(=\frac{\sqrt{7}-\sqrt{5}}{7-5}+\frac{2(1+\sqrt{7})}{1-7}=\frac{\sqrt{7}-\sqrt{5}}{2}-\frac{1+\sqrt{7}}{3}=\frac{\sqrt{7}-3\sqrt{5}-2}{6}\)
TP
4
KL
3
MN
8 tháng 1 2021
My name is Nhan, i'm 12. My hoppy is listen to music, draw and watch TV. On holiday, I spend most of my time to perform hobbies. I spend most of my time watching TV, then listening to music and drawing a bit. My friends are very few watching TV, they often hang out, meet friends and exercise.I did not go out much, so I watched TV as direct contact with nature outside. In addition to watching TV, my second preference is listening to music. I hear their melody and enjoy it, and it makes me feel more relaxed and relaxed.Finally drawing, I loved drawing since childhood and my dream is to become a painter. I love these hobbies.
M
8 tháng 1 2021
nè bạnMy favourite hobby is reading. I enjoy reading a book when I am free. I started to do it when I was four years old. The first time I did it, I felt interested. So I kept reading. The teachers always taught me to read the difficult words. I was happy when I read a story with a happy ending. I was thrilled when I read a detective story. I enjoy reading because I like to explore the imaginative world of my favourite author, J.K.Rowling who writes “ Harry Potter” . There are a lot of advantages of reading. Reading can make me relaxed and calm. I can also learn new vocabulary items. Then I can further improve my English. Moreover, it can give me an unlimited imagination, so I can write books in the future. I can learn the different cultures and customs of other countries in the world too. I read at least one hour every day. I read books by myself. I usually read it at home. I wish I could read different kinds of books because it might be very challenging.
tham khảo nha bạn!
2 tháng 12 2021
2. grandparents
3. single
4. single
5. daughter
6. surname
7 tháng 5 2022
ummm....mình nghĩ bn có thể tham khảo cái câu này=,)
I do my homework trong đó có:
I: S
do: V
my homework: O
hoặc là Peter is reading a novel
Peter: S
is reading: V
a novel: O
:DD
LS
6 tháng 2 2022
Tham khảo
Bức tranh dân gian "Chợ Tết" của Đoàn Văn Cừ mang vẻ đẹp vừa bình dị thân thuộc, vừa rực rỡ sắc màu. Tác giả đã làm sống lại cảnh vật và cuộc sống nơi đồng quê đậm đà màu sắc văn hóa dân gian với tất cả tấm lòng yêu thương nồng hậu.
NT
3