Giúp mình bài này với
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\(a,=\dfrac{3\left(2x-1\right)}{x}\cdot\dfrac{3x^2}{\left(2x-1\right)\left(2x+1\right)}=\dfrac{9x}{2x+1}\\ b,=\left[\dfrac{x}{y\left(2y-x\right)}+\dfrac{4y}{x\left(x-2y\right)}\right]\cdot\dfrac{2y-x}{y}\\ =\dfrac{4y^2-x^2}{xy\left(x-2y\right)}\cdot\dfrac{2y-x}{y}=\dfrac{x^2-4y^2}{xy^2}\)
1 is bigger than mine
2 the tallest student in my class
3 speaks English better than Mum
4 cook as well as lan
5 the best in the city
6 is better than this one
7 is a more careful writer than she is
8 drives more carefully than Peter
a: Ta có: \(2\sqrt{28}+3\sqrt{63}-3\sqrt{\dfrac{112}{9}}-\sqrt{\dfrac{196}{7}}\)
\(=4\sqrt{7}+9\sqrt{7}-4\sqrt{7}-2\sqrt{7}\)
\(=7\sqrt{7}\)
b: Ta có: \(\sqrt{8+2\sqrt{7}}-\sqrt{12-\sqrt{140}}-\sqrt{5}\)
\(=\sqrt{7}+1-\sqrt{7}+\sqrt{5}-\sqrt{5}\)
=1
1.played
2. to see
3. Are, watching
4. won't
5. Have, known (câu này bừa)
6. cooking
7. didn't do
8. going
9. hasn't seen (câu này cũng bừa)
10. are playing
11. speak
12. to go
1.Played
2. seeing
3.Are / watching
4.won't go
5.Are / know
6.cooking