1 d

2 b thứ 4 ngày 24 tháng 2

3  Số sticker để đổi được 10 món quà là :

        5 x 10 = 50 ( sticker)

đáp số 50 sticker

<=> \(\sqrt{2x-1}=\dfrac{17}{12}\)

<=> 2x - 1 = \(\dfrac{289}{144}\)

<=> 2x = \(\dfrac{433}{144}\)=> x = \(\dfrac{433}{288}\)

1Does Sally have to wear uniform?

2 To play well rugby you have to be fit

3 We don't have to practice a lot at weekends

4 Do they have to buy expensive shoes for the race?
5 He doesn't have to practise everyday

2 - priority

4- documentary

<=> x^2 + 4x + 4 - x - 2 = 0 <=> x^2 + 3x +2 = 0

<=> (x+1)(x+2) = 0 => x=-1

                                    x=-2