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16 tháng 11 2021
\(a,=2\sqrt{2a}+3\sqrt{2a}-4\sqrt{2a}=\sqrt{2a}\\ b,=3\sqrt{5}-3+\sqrt{5}=4\sqrt{5}-3\\ c,=\dfrac{\sqrt{3}-1+\sqrt{3}+1}{\left(\sqrt{3}+1\right)\left(\sqrt{3}-1\right)}=\dfrac{2\sqrt{3}}{2}=\sqrt{3}\\ d,=-7+5-2\cdot\dfrac{2}{3}+\dfrac{1}{3}\cdot3=-2-\dfrac{4}{3}+1=-\dfrac{7}{3}\)
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Đỗ Thanh Hải
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2 tháng 9 2021
1 don't have to
2 mustn't steal
3 had to go
4 have to wear
5 must hurry
6 have had to wear
7 mustn't write
8 has to work
9 must stay
10 must get
11 have to wear
12 must leave
13 have to
14 mustn't lose
15 didn't have to
1 to smoke a lot
2 to their customs
3 get used to staying up late
4 used to be some trees in this field
5 to live in Paris
6 to drink a lot of coffee
7 used to drinking beer
8 to staying up late
9 to be a statue in front of it
10 to the new rule