ai giúp mik mấy câu anh 8 vs
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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.
\(=\frac{\sqrt{7}-\sqrt{5}}{(\sqrt{7}-\sqrt{5})(\sqrt{7}+\sqrt{5})}+\frac{2(1+\sqrt{7})}{(1-\sqrt{7})(1+\sqrt{7})}\)
\(=\frac{\sqrt{7}-\sqrt{5}}{7-5}+\frac{2(1+\sqrt{7})}{1-7}=\frac{\sqrt{7}-\sqrt{5}}{2}-\frac{1+\sqrt{7}}{3}=\frac{\sqrt{7}-3\sqrt{5}-2}{6}\)
6 tháng 11 2021
Do you l.i.k.e English? - Yes, i do
@Bảo
#Cafe
KM
6 tháng 10 2018
Dốt hay khôg là do bạn đó ! Nên bạn hãy thật cố gắng để
Hok tốt tiếng Anh hơn nhé ! Còn bài kia mik chưa có hok , đây tiếng Anh lớp 7 mik ms lớp 5
Hok tốt !!
# MissyGirl #
6 tháng 10 2018
Jack had his house painted last week.Dịch: Jack đã nhờ người sơn nhà vào tuần trước.
26 tháng 2 2021
Spring comes in the sky and a variety of flowers bloom, and it is said that spring is the season of fertility. In winter, the trees empty their leaves, then in spring, the branches grow, the leaves are brought back, the small spring sprouting seems to open a new life in the world. And so it begins a new life cycle. Not only did the foliage of the branches revive after a cold winter, but it was as long as a hibernation, but the spring flowers also became bright. On that spring day, wherever I go, I can see a lush scene with a plastic forehead to live for life. really all like having a common beauty that is fertility. Especially spring usually has spring rains, spring rain is small and does not wet much, it can only wet you when you stand under it for too long. The whole day of heavy rain like that, but people think that those rains are the drops that make the spring's lush, so it is like the seed of the god's gift. Spring has sprung up so that the green summer comes again. Spring brings fresh things in 3 good months. Saying goodbye to spring also brings nostalgia for the kids because the Tet holiday goes by so quickly, it's fun to let the bad things be forgotten. Spring has brought a joyful and crowded atmosphere to everyone. Goodbye, Dear Spring! ( mình viết hơi ít chi tiết đêr tạm biệt mùa xuân.-. Lan man quá ý )
TN
21 tháng 10 2018
I have short black hair
I am tall and clever, so hard-working
This is me. I'm Kane
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