Question

SOS ;-;;;;; đừng có làm bài SPRING FESTIVAL 

 

Answer 1

lm hết lun hả :v?

Answer 2

Thi  ạ e

Answer 3

Uk e 

Answer 4

A.

I.

1. The blue bag is mine.

2. Hoa has more books than Minh.

3. Why your friends are saving money?

4. A solutiong to the problem of overpopulation will be soon found by scientists.

II.

1. C

2. B

3. A

4. C

5. A

6. C

7. D

8. B (chưa học cấu trúc loại nài bao giờ :vv)

B.

I.

1. In Milton Keynes

2. They can read the news, check e - mail or play video games.

3. hăm bíc :>

4. giống câu 3 :>

Answer 5

huộc : `\in`

Khác : `\ne `

Answer 6

`a(a-6)+10>0`

`=a^2 - 6a + 10`

`=(a-3)^2 + 1`

Mà : `(a-3)^2 ≥ 0`

`1 >0`

`=>a(a-6)+10>0 (đfcm)`

Answer 7

`a(a-6)+10>0`

`=a^2 - 6a + 10`

`=a^2 - 6a + 1 + 9`

`=(a-3)^2 + 1`

Mà : `(a-3)^2 ≥ 0`

`1 >0`

`=>a(a-6)+10>0 (đfcm)`

Answer 8

$\sqrt{2}$

Answer 9

$\sqrt{3x}$ + 15 = 96

Answer 10

`////

Answer 11

`////`

Answer 12

`{(a= 15 . 15 = 225),(b= 15 . 16 = 240),(c=15.17 = 255):}`

Answer 13

 `-230 $\not\vdots$8`

Answer 14

`(\sqrt(a^(3)b)+\sqrt(ab^(3))-ab)//sqrt(ab)`

Answer 15

Từ từ cj bổ sung câu cuối do làm nhìu quá lên lú :")

`2x = 84/163`

`x=84/163:2`

`x=84/163xx 1/2`

`x=42/163`

Answer 16

`1+2+3+...+2012+2013`

Khoảng cách : `1`

Số hạng :

`(2013-1)/1 + 1 = 2013(số-hạng)`

Tổng dãy số trên :

`(2013+1)xx2013:2=2027091`

Answer 17

$\begin{cases} a\\b\\c \end{cases}$

Answer 18

$\begin{cases} a=0,1 xx 4 = 0,4\\b=0,1 xx 5 = 0,5\\c =0,1 xx 6 =0,6\end{cases}$

Answer 19

`{(a=0,1xx4=0,4),(b=0,1xx5=0,5),(c=0,5xx1):}`

Answer 20

`\widehat{KLO}KLO = 45°`. Tính `\widehat{KTH}KTH`.

Answer 21

`1/2+5/6+11/12+19/20+29/30 +41/42+55/56 + 71/72 + 89/90`

`=(1-1/2)+(1-1/6)+(1-1/12)+(1-1/20)+(1-1/30)+(1-1/42)+(1-1/56)+(1-1/72)+(1-1/90)`

`=1-1/2 +1-1/6 +1-1/12 +1 - 1/20+1-1/30 +1-1/42+1-1/56+1-1/72+1-1/90`

`=1-1/2 +1-1/6 +1-1/12 +1 - 1/20+1-1/30 +1-1/42+1-1/56+1-1/72+1-1/90`

`=(1+1+1+1+1+1+1+1+1)-(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)``=9-(1/(1xx2) + 1/(2xx3) + 1/(3xx4) + 1/(4xx5) + .......+1/(9xx10)``=9 - (1-1/2+1/2-1/3+..........+1/9-1/10)``=9 -(1-1/10)``=9-(10/10-1/10)``=9-9/10``=90/10-9/10``=81/10`

Answer 22

`3/4-(4x-1/2)=1/2`

`4x-1/2=3/4-1/2`

`4x-1/2=3/4-2/4`

`4x-1/2=1/4`

`4x=1/4+1/2`

`4x=1/4+2/4`

`4x=3/4`

`x=3/4:4`

`x=3/4 xx 1/4`

`x=3/16`

___________________________________

`(3/4 x-1/2):4/5=1/2+2`

`(3/4 x-1/2):4/5=1/2+4/2`

`(3/4 x-1/2):4/5=5/2`

`3/4x-1/2=5/2 xx 4/5`

`3/4x-1/2 = 2`

`3/4x=2+1/2`

`3/4x=4/2+1/2`

`3/4x=5/2`

`x=5/2:3/4`

`x=5/2 xx 4/3`

`x=10/3`  

Answer 23

`2198+276+324`
`= 2 198 + ( 276+324)`
`= 2 198 + 600`
`= 2798`

__________________________________________
`135+360+265+140`
`=  (360+140)+(135+265) `
`= 500+40-`
`= 900`

_____________________________________________
`x+2021=4000`
`x=4000-2021`
`x=1979`

______________________________
`362+x=3362`
`x=3362-362`

`x=3000`

______________________
`376-x=126`
`x=376-126`
`x=250`

___________________________
`x-653=367`
`x=367+653`
`x=1020`

Answer 24

`4(3x-2)-2x=28`

`12x-8-2x=28`

`12x-2x=28+8`

`(12-2)x=36`

`10x=36`

`x=36:10

`x=18/5`

Answer 25

Cho hình thang `ABCD` có `AB////CD` biết \(\widehat{D}=60^0\) ,`3B=2C`.tính số đo góc `A,B,C`

Answer 26

`x_2^2`