I. Put the verbs in the correct tenses

1. I often (wash) wash my clothes.

2. She (not be) isn't at home

3. .Do.You often (write) ....write.......to your friend?

4. Mr.Mai (water) ...waters.... the plant evey morning.

5. We (meet) ...meet....... each other twice a month.

6. He (listen) ..is listening.. to the telephone at the moment.

7. They always (not go) ..don't always go...to the school by train.

8. He (drink) ..is drinking.. beer at the bar

9. They usually (sing) .sing.. in the early morning.

10. Mi and Thanh (talk) ......Are Mi and Thanh talking......... on the telephone now?

11. They (plant) ..plant.......trees in the early year.

12. He (not study)..isn't studying... Math at the moment.

13. She (play) ..Does she play.. badminton every afternoon?

14. They sometimes (do) .....do......... morning exersices at 5.30.

15. Thanh and I (be) .....are...... at home now.

16. Hung (run) ....runs...... about 5 km every morning.

17.Do  Hung and Minh sometimes (meet) .....meet.....each other?

18. Every evening, she (jog) …jogs…about 3 km.

19.......Is.he.........................your father?

20. He always (drive) ..drives..his car to work. But now, he (ride) ...is riding... his motorbike to work. 

II. Complete the sentences with the correct form of the verb in brackets.

1.      Which sports do you (play) play at the weekends?

2.      My brother (buy) .…bought. 2 tickets for the table tennis match yesterday.

3.      Last weekend I (play) played with my friends and we (have). a very good time.

4.      Nowadays many girls (like/do) like doing aerobics to keep fit.

5.      What time do you (arrive)…arrive…….. at the stadium?

6.      How often does he (go/fish) go fishing?

7. Did your team (win) win yesterday?

8.      My sister (play). ……plays……..     badminton twice a week. She (do) does it on Saturday and Sunday.

9.      Where did you (go) go on holiday last year?

10.     I (cycle)………cycled………   100 kilometers last week

\(x.\left(2x-9\right)=3x.\left(x-5\right)\)

\(\Leftrightarrow2x^2-9x=3x^2-15x\)

\(\Leftrightarrow2x^2-9x-3x^2+15x=0\)

\(\Leftrightarrow-x^2+6x=0\)

\(\Leftrightarrow x.\left(-x+6\right)=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\-x+6=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\-x=-6\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x=6\end{matrix}\right.\)

Vậy.....

$x.\left(2x-9\right)=3x.\left(x-5\right)$

$\iff 2x^2-9x=3x^2-15x$

$\iff 2x^2-9x-3x^2+15x=0$

$\iff -x^2+6x=0$

$\iff x.\left(-x+6\right)=0$

$\iff \{\begin{array}{c}x=0\\ -x+6=0\end{array}$

$\iff \{\begin{array}{c}x=0\\ -x=-6\end{array}$

$\iff \{\begin{array}{c}x=0\\ x=6\end{array}$

Vậy x=6.

HT

báo cáo nhà cho bạn vé

linh chó

Hát ntn?

Đây nhé :

Ta sẽ nắm tay và đi hết cuộc đời này em ơi

Ta sẽ chia mọi buồn đau hay bao ngọt ngào

Hãy khoác lên mình chiếc váy cưới nhỏ xinh này em ơi

Lại đây với anh đi em mình cùng say phút lâu dài.

Đó nhé

là núi e-vơ-rét nha

HT

là ngọn núi e-vơ-rét nhé

=100000000000000000000000000000 nha

HT

= 100000000000000000000000000000 nhé

1234 x 1234 = 1522756 nhé

= 1 522 756 nha

a) \(A=\dfrac{2}{3}x^3y.\dfrac{3}{4}xy^2z^2=\left(\dfrac{2}{3}.\dfrac{3}{4}\right)\left(x^3.x\right)\left(y.y^2\right)z^2=\dfrac{1}{2}x^4y^3z^2\)  

b) Bậc của đơn thức thu gọn là : 4+3+2 = 9 

c) Phần hệ số của đơn thức thu gọn A là : \(\dfrac{1}{2}\) 

Phần biến của đơn thức thu gọn là: \(x^4y^3z^2\) 

d) Tại x = -1 ; y = -2 ; z = -3 ta có :\(A=\dfrac{1}{2}x^4y^3z^2=\dfrac{1}{2}.\left(-1\right)^4.\left(-2\right)^3.\left(-3\right)^2=\dfrac{1}{2}.1.\left(-8\right).9=-\dfrac{72}{2}=-36\)

Vậy tại x = -1 ; y = -2 ; z = -3 thì A = -36