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Phạm Mạnh Kiên
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Nguyễn Hoàng Minh
13 tháng 9 2021 lúc 14:47

\(1,\\ a,=\dfrac{\left(3+2\sqrt{3}\right)\sqrt{3}}{3}+\dfrac{\left(2+\sqrt{2}\right)\left(\sqrt{2}-1\right)}{1}\\ =\dfrac{3\sqrt{3}+6}{3}+\sqrt{2}=\sqrt{3}+1+\sqrt{2}\\ b,=\left(\dfrac{\sqrt{5}+\sqrt{2}}{3}-\dfrac{\sqrt{5}-\sqrt{2}}{3}+1\right)\cdot\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{\sqrt{5}+\sqrt{2}-\sqrt{5}+\sqrt{2}+3}{3}\cdot\dfrac{1}{\left(\sqrt{2}+1\right)^2}\\ =\dfrac{2\sqrt{2}+3}{3\left(3+2\sqrt{2}\right)}=\dfrac{1}{3}\)

\(2,\\ A=2x+\sqrt{\left(x-3\right)^2}=2x+\left|x-3\right|\\ =2\left(-5\right)+\left|-5-3\right|=-10+8=-2\\ B=\dfrac{\sqrt{\left(2x+1\right)^2}}{\left(x-4\right)\left(x+4\right)}\left(x-4\right)^2=\dfrac{\left|2x+1\right|\left(x-4\right)}{x+4}\\ B=\dfrac{17\cdot4}{12}=\dfrac{17}{3}\)

Phạm Mạnh Kiên
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htfziang
31 tháng 10 2021 lúc 16:50

đăng r hạn chế đăng lại b nhé, sẽ có ng trl mà

Phạm Mạnh Kiên
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Đỗ Thanh Hải
12 tháng 9 2021 lúc 14:38

1 was arrested before the garden by the boy yesterday

2 his cats taken care of carefully by Jack everyday

3 Has the country been protected from Covid-19 successfully

4 is reported that the man is running out of money

is reported to be running out of money\

5 has been said that the thief got out of the prison

has been said to have got out of the prison

6 was thought that Mary had turned down the job

Mary was thought to have  turned down the job

Phạm Mạnh Kiên
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Đỗ Thanh Hải
5 tháng 9 2021 lúc 15:48

1 is grown in many countries in the world

2 was invented by Graham bell many years ago

3 has been used for many years

4 Is English practiced by Lan everyday

5 will be taken out of the city 

6 can this letter be sent by Mary 2 days ago

7 is being made from vegetables

8 must be finished before Sunday

9 hadn't been used for a long time

10 Will I be met at the airport by Jack tomorrow

12 It is thought that Maradona is.....

13 It has been believed that the job is.....

14 It was explained that this powerful.....

Phạm Mạnh Kiên
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Phạm Mạnh Kiên
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Phạm Mạnh Kiên
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Minh Nhân
5 tháng 12 2021 lúc 13:15

Em tách ra từng bài nhé !

Phạm Mạnh Kiên
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Phạm Mạnh Kiên
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