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TK

1............to work by car everyday

2 ........Khanh does morning exercise, he won't keep fit

3......has a small garden

4 .....has to go to school on time

5 ......she doesn't go to bed early, she will be late for class

6 .......go to the movie tonight

\(\text{⩷!⨙┏⇴⨗⨜}\)

11) \(\dfrac{2\sqrt{3}-\sqrt{15}}{\sqrt{3}}\)

\(=\dfrac{\left(2\sqrt{3}-\sqrt{15}\right)\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}\)

\(=\dfrac{2\cdot\sqrt{3}\cdot\sqrt{3}-\sqrt{15}\cdot\sqrt{3}}{3}\)

\(=\dfrac{6-3\sqrt{5}}{3}\)

\(=2-\sqrt{5}\)

12) \(\dfrac{2\sqrt{2}+\sqrt{2}}{5\sqrt{2}}\)

\(=\dfrac{3\sqrt{2}}{5\sqrt{2}}\)

\(=\dfrac{3}{5}\)

11: \(=\dfrac{\sqrt{3}\left(2-\sqrt{5}\right)}{\sqrt{3}}=2-\sqrt{5}\)

12: \(=\dfrac{3\sqrt{2}}{5\sqrt{2}}=\dfrac{3}{5}\)

d: Ta có: \(12x^2+7x-12\)

\(=12x^2+16x-9x-12\)

\(=4x\left(3x+4\right)-3\left(3x+4\right)\)

\(=\left(3x+4\right)\left(4x-3\right)\)

e: Ta có: \(15x^2+7x-2\)

\(=15x^2+10x-3x-2\)

\(=\left(3x+2\right)\left(5x-1\right)\)