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DT
Đỗ Thanh Hải
CTVVIP
9 tháng 3 2021
1 Preserving natural resources means reserving them for our future
2 In spite of the increase in air fares, most people still prefer to travel by plane
3 Regardless of your teaching method, the objective of any conversation class should be for student to practice spoken words
4 An injured man was taken to the hospital
5 In order for one to achive the desired results in this experiment, it is necessary that he work as fast as possible
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DT
Đỗ Thanh Hải
CTVVIP
16 tháng 3 2021
III
1 putting
2 will push
3 doing
4 are being grown
5 to start
6 is
7 uses
8 to make
9 pulling
10 being grown
IV
1 was
2 born
3 in
4 from
5 be
6 age
7 to
8 By
9 was
10 prize
a: \(A=\left(\dfrac{\sqrt{x}\left(\sqrt{x}-3\right)}{\left(\sqrt{x}-3\right)\left(\sqrt{x}+3\right)}-1\right):\left(\dfrac{9-x}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}+\dfrac{\left(\sqrt{x}-3\right)\left(\sqrt{x}+3\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+3\right)}-\dfrac{\left(\sqrt{x}-2\right)^2}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}\right)\)
\(=\left(\dfrac{\sqrt{x}}{\sqrt{x}+3}-1\right):\dfrac{9-x+x-9-\left(\sqrt{x}-2\right)^2}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}\)
\(=\dfrac{\sqrt{x}-\sqrt{x}-3}{\sqrt{x}+3}\cdot\dfrac{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}{-\left(\sqrt{x}-2\right)^2}\)
\(=\dfrac{-3\left(\sqrt{x}-2\right)}{-\left(\sqrt{x}-2\right)^2}=\dfrac{3}{\sqrt{x}-2}\)