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14 tháng 2 2022
a, Ta có : \(A=\frac{2}{3}x^3y.\frac{3}{4}xy^2z^2=\frac{1}{2}x^4y^3z^2\)
b, Bậc : 4
c, hệ số : 1/2 ; biến x^4y^3z^2
d, Thay x = -1 ; y = -2 ; z = -3 vào đơn thức trên ta được
\(A=\frac{1}{2}.1.\left(-8\right).9=-36\)
12 tháng 2 2022
Question 1. He ..... a doctor.
A. was
B. were
Question 2. Water
A. Countable nouns
B. Uncountable nouns
Question 3. ......... you student
A. am
B. is
C. are
Question 4. She ...... a teacher.
A. were
B. was
Question 5. He/She/It .....
A. am
B. is
C. are
Question 6. I ...
A. am
B. is
C. are
Question 7. We/You/They ....
A. am
B. is
C. are
Question 8. I/He/She/It .....
A. was
B. were
Question 9. We/You/They .....
A. was
B. were
Question 10. Ben is in the hospital.
He is a ......
A. berre
B. sherry
C. doctor
Question 11. The students and teacher is in the school
Ben is a ........
A. student
B. teacher
Mary is a .......
A. teacher hai câu này đều chọn được nhé!
B student
Thu gọn
R
13 tháng 2 2022
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
SS
12 tháng 2 2022
\(x.\left(2x-9\right)=3x.\left(x-5\right)\)
\(\Leftrightarrow2x^2-9x=3x^2-15x\)
\(\Leftrightarrow2x^2-9x-3x^2+15x=0\)
\(\Leftrightarrow-x^2+6x=0\)
\(\Leftrightarrow x.\left(-x+6\right)=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\-x+6=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\-x=-6\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x=6\end{matrix}\right.\)
Vậy.....
13 tháng 2 2022
x.(2x−9)=3x.(x−5)x.(2x−9)=3x.(x−5)
⇔2x2−9x=3x2−15x⇔2x2−9x=3x2−15x
⇔2x2−9x−3x2+15x=0⇔2x2−9x−3x2+15x=0
⇔−x2+6x=0⇔−x2+6x=0
⇔x.(−x+6)=0⇔x.(−x+6)=0
⇔{x=0−x+6=0⇔{x=0−x+6=0
⇔{x=0−x=−6⇔{x=0−x=−6
⇔{x=0x=6⇔{x=0x=6
Vậy x=6.
HT
12 tháng 2 2022
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
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