15 + 25 : x = 25

        25 : x = 25 - 15

        25 : x = 10

               x = 25 : 10

               x = \(\frac{25}{10}\)

15+25:x=25

25:x=25-15

25:x=10

x=25:10

x=2,5

xem lại đề bạn nhé

9-25=(7-x)-(25+7)

( 7 - x ) - ( 25 + 7 ) = 9 - 25

( 7 - x ) - 32 = - 16

     7 - x      = ( - 16 ) + 32 

      7 - x     = 16

           x     = 7 - 16

           x     = - 9

Vậy x = - 9 

9 - 25 = ( 7 - x ) - ( 25 + 7 )

x = 7 - 25 - 7 - 9 + 25

x = ( 7 - 7 ) + ( 25 - 25 ) -9

x =  0  + 0 - 9

x= - 9

=> x= - 9 

Vậy x = - 9

\(x\times x=\dfrac{1}{25}\)
\(x\times x=\dfrac{1}{5}\times\dfrac{1}{5}\)
\(x=\dfrac{1}{5}\)

`x xxx=1/25`

`=> x^2=(+-1/5)^2`

`=>x=1/5` hoặc `x=-1/5`

Vậy `x=1//5;-1/5`

3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25 

= 3/25 x 13/7 + 3/7 x 1/25 

= (3 x 13/7 + 3/7 ) x 1/25 

= 42/7 x 1/25 

= 6 x 1/25 

= 6/25

\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)

\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)

\(=\dfrac{39}{175}+\dfrac{3}{175}\)

\(=\dfrac{39+3}{175}\)

\(=\dfrac{42}{175}\)

\(=\dfrac{6}{25}\)

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{15}{7}\) + \(\dfrac{3}{25}\) \(\times\) \(\dfrac{1}{7}\) - \(\dfrac{2}{7}\times\) \(\dfrac{3}{25}\)

A = \(\dfrac{3}{25}\) \(\times\)( \(\dfrac{15}{7}\) + \(\dfrac{1}{7}-\dfrac{2}{7}\))

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{14}{7}\)

A = \(\dfrac{6}{25}\)

25 x 35 + 25 x 65

= 25 x (35 + 65)

= 25 x 100

= 2500

25 x 35 + 25 x 65

=25 x (35 + 65 )

=25 x 100

=2500

kb nha

2500 k và kết bạn nha

a)y+25=(-63)-(-7)

y+25=(-63)+7

y+25=-56

y=(-56)-25

y=-81

b.y+20=95-75

y+20=20

y=20-20

y=0

c.11-(15+11)=x-(25-9)

11-26=x-16

-15=x-16

x=-15+16

x=1

d)x-25=(7-x)-(25+7)

2x-25=7-(25+7)

2x-25=7-32

2x-25=-25

2x=(-25)+25

2x=0

x=0:2

x=0

tick cho mk nha bạn

        (x+40)x25=2000

=>    x+40=2000:25

=>    x+40=80

=>    x=80-40

=>   x=40

Vậy x=40

      (x-10)x5=100-20x4

=>  (x-10)x5=100-80

=>  (x-10)x5=20

=>   x-10=20:5

=>   x-10=4

=>   x=4+10

=>   x=14

Vậy x=14

      x:2x36=540

=>  x:2=540:36

=>  x:2=15

=>  x=15x2

=>  x=30  

Vậy x=30

      (72x135+9x28x15):25-3500:25

=    (72x135+135x28):25-3500:25

=     135x(72+28):25-3500:25

=     135x100:25-3500:25

=     13500:25-3500:25

=     (13500-3500):25

=     10000:25

=      400

Ai cùng đáp án thì tk và kb vs mk nha !!! Mk cảm ơn nhìu >.<

(x+40) nhân 25= 2000

(x+40)= 2000: 25

x+40= 80

x=80-40

x= 40

(x-10) nhân 5= 100- 20 nhân 4

(x-10) nhân 5= 20

(x-10) =20:5

x-10= 4

x=4+10

x=14

x:2x 36=540

x:2= 540:36

x:2=15

x= 15x 2

x= 30

(72x 135+ 9x 28x 15) : 25- 3500: 25

(72x 135+ 135x 28): 25- 3500:25

((72+28) x135): 25-3500: 25

100x 135: 25- 3500:25

13500: 25- 3500: 25

( 13500-3500) : 25

10000: 25

400

nha bn

36 . x ( x + 10 )  = 540

25 % x X + X = 5

0,25 x X + X = 5

(0,25 + 1) x X = 5

       1,25 x X = 5

                 X = 5 : 1,25

                 X = 4

Vậy X = 4

kb vs tớ nha

4 ban nha.cach lam thi nhu tren thoi