x/3=7/15+-1/5                             

x/3=2/15                                       

5x/15=2/15                                    

5x=2                                                  

x=2/5

x= 2/5

CHÚC BẠN HỌC TỐT 

4 (x-3)=3
x-3=3:4
x-3=0,75
x=0,75+3
x=3,75

b, 4 ( x - 3 ) = 3

x - 3 = \(\dfrac{3}{4}\) = 0,75 

x = 0,75 + 3 = 3,75

x=3:4+3=15/4

\(\dfrac{10^3+5\cdot10^2+5^2}{6^3+3\cdot6^2+3^3}=\dfrac{5^3\cdot2^3+5\cdot2^2\cdot5^2+5^2}{2^3\cdot3^3+3\cdot2^2\cdot3^2+3^3}\\ =\dfrac{5^3\left(2^3+2^2+1\right)}{3^3\left(2^3+2^2+1\right)}=\dfrac{5^3}{3^3}=\dfrac{125}{27}\)

5/x + y/4 = 1/8 ( Đề sai )

Đề đúng :

 5/x - y/4 = 1/8

  20/x.4 - y.x/4.x = 1/8

Suy ra x . 4 = 8

x = 2

y/4 = 5/2 - 1/8= 9.5/4

Tường thuật câu mệnh lệnh, yêu cầu:

1."Sit down, Mary"

mary told me to sit down

2."Don't go near the sea, chilren"

I told them not to go near the sea,

3."Don't be late, Jim", Jim's father told

JIM'S FATHER TOLS HIM NOT TO BE LATE

4."Hurry up", he told me

HE TOLD ME TO HURRY UP

5."Do this test again, please"

SHE TOLD ME NOT TO DO THAT TEST AGAIN

6."Don't make noise in class"

HE TOLD HER NOT TO MAKE NOISE IN CLASS

7."Don't use the telephone after seven o'clock"

SHE TOLD HIM NOT TO USE THE TELEPHONE AFTER SEVEN O'CLOCK

8."Would you open the dor, please?"

SHE TOLD ME TO OPEN THE DOOR

9."Could you lend me some money, please?"

HE ASKED ME TO LEND HIM SOME MONEY

10."Would you pass me a cigarrete?"

HE TOLD ME TO PASS HIM A CIGARRETE

11.Will you clean the floor for me?"

SHE TOLD ME TO CLEAN THE FLOOR FOR HER

12."Can you help me to do this test?"

SHE ASKED ME TO DOT HAT TEST FOR HER

Tường thuật câu mệnh lệnh, yêu cầu:

1."Sit down, Mary"

=> I told Mary to sit down.

2."Don't go near the sea, chilren"

=> They told children not to go near the sea.

3."Don't be late, Jim", Jim's father told

=> Jim's father told him not to be late.

4."Hurry up", he told me

=> He told me to hurry up.

5."Do this test again, please"

=> The teacher told me to do that test again.

6."Don't make noise in class"

=> The teacher told us not to make noise in class.

7."Don't use the telephone after seven o'clock"

=> She told me not to use the telephone after seven o'clock.

8."Would you open the dor, please?"

=> He told me to open the door.

9."Could you lend me some money, please?"

=> He told me to lend him some money.

10."Would you pass me a cigarrete?"

=> He told me to pass him a cigarrete.

11.Will you clean the floor for me?"

=> She told me to clean the floor for her.

12."Can you help me to do this test?"

=> My friend told me to help her to do that test.

4 + x = 7 - 2x

4 + x + 2x = 7

4 + 3x = 7

3x = 7 - 4

3x = 3

x = 3 : 3

x =1

5 + x = 8,3 + 4,7 - x

5 + x + x = 8,3 + 4,7

5 + 2x = 13

2x = 13 -  5

2x = 8

x = 8 : 2

x= 4

Làm đc thì mình k cho 5 cái luôn

a -50

b-2008

a) Giá trị của biểu thức là âm 50

b) Giá trị của biểu thức là âm 2008

Chúc bạn may mắn nhé!

 \(\dfrac{5}{7}< \dfrac{x}{5}< 1\) 

\(\dfrac{5\times5}{7\times5}< \dfrac{7\times x}{7\times5}< \dfrac{35}{35}\)

\(\dfrac{25}{35}< \dfrac{7\times x}{35}< \dfrac{35}{35}\)

\(25< 7\times x< 35\)

\(\dfrac{25}{7}< x< \dfrac{35}{7}\)

\(\dfrac{25}{7}< x< 5\)

\(3< x< 5\) (x is the natural number)  

x=4 

 answer please