x - (28 - x) = x - 24x−(28−x)=x−24.

28 x 45 + 28 x 56 - 28

=28 x 45 + 28 x 56 - 28 x 1

=28 x (45+56-1)

= 28 x 100

= 2800

cứu mik mn oii

28 x 45 + 28 x 56 - 28

=28 x 45 + 28 x 56 - 28 x 1

=28 x (45+56-1)

= 28 x 100

= 2800

10

46

28

29

k mk nhe

x + 87 = 97

       x = 97 - 87

        x = 10

x - 28 = 18

       x = 18 + 28

       x = 46

28 + x = 56

        x = 56 - 28

        x = 28

85 - x = 56

        x = 85 - 56

        x = 29

k cho mik nhé

()x+87=97

x=97-87=10

()x-28=18

x=18+28=46

()28+x=56

x=56-28=28

()58-x=56

x=85-56=29

\(\frac{8}{23}\cdot\frac{46}{24}-x=\frac{1}{3}\)

=> \(\frac{2}{3}-x=\frac{1}{3}\)

=> \(x=\frac{1}{3}\)

\(\frac{10}{12}\div x=\frac{28}{9}\cdot\frac{3}{56}\)

=> \(\frac{10}{12}\div x=\frac{1}{6}\)

=> \(x=\frac{60}{12}=5\)

\(\frac{x-12}{4}=\frac{1}{2}\)

=> \(\left(x-12\right)\cdot2=4\cdot1\)

=> \(2x-24=4\)

=> \(2x=28\)

=> \(x=14\)

B

B

B

\(B=\left(4^5\cdot10\cdot5^6+25^5\cdot2^8\right):\left(2^8\cdot5^4+5^7\cdot2^5\right)\)

\(B=\dfrac{4^5\cdot10\cdot5^6+25^5\cdot2^8}{2^8\cdot5^4+5^7\cdot2^5}\)

\(B=\dfrac{\left(2^2\right)^5\cdot2\cdot5\cdot5^6+\left(5^2\right)^5\cdot2^8}{2^8\cdot5^4+5^7\cdot2^5}\)

\(B=\dfrac{2^{11}\cdot5^7+5^{10}\cdot2^8}{2^8\cdot5^4+5^7\cdot2^5}\)

\(B=\dfrac{2^8\cdot5^7\cdot\left(2^3\cdot1+5^3\cdot1\right)}{2^5\cdot5^4\cdot\left(2^3\cdot1+5^3\cdot1\right)}\)

\(B=\dfrac{2^8\cdot5^7}{2^5\cdot5^4}\)

\(B=\dfrac{2^3\cdot5^3}{1\cdot1}\)

\(B=\left(2\cdot5\right)^3\)

\(B=10^3\)

\(B=1000\)

A, 2 x 26 x 5 =( 5 x 2) x 26

10 x 26

=260                   

 b,4 x 37 x 25 =( 4 x 25) x 26

= 100 x 26

= 3700           

 c, 25 x 5 x 4 x 27 x 2 =( 25 x 4 ) x ( 2x 5) x 27

= 100 x 10 x 27 

= 1000x 27 

=27000

d,28 x 64 + 28 x 36 = 28 x ( 64 + 36 )

= 28 x 100

=2800

 e, 769 x 85 - 769 x 75  = 769 x ( 85 - 75 )

=769 x 10

=7690

f, 56 x 37 + 56 x 63 = 56 x ( 37 + 63 )

= 56 x 100

=5600

a. = 26 x (2 x 5)

   = 26 x 10 =260

b.=( 25x4) x37

   =100 x37=3700

c.=(25x4) x(5x2) x27

   =100 x10 x27

   = 27000

d.=28 x( 64+36)

   =28 x100

  = 2800

e.=769 x( 85-75)

    =769 x10 =7690

f. =56 x(37 +63)

  =56 x100

= 5600

a) x + 25 = 53

        x = 53 - 25

        x = 28 

b) x - 56 = 28

       x = 28 + 56

       x = 84

c) 56 - x = 17

      x = 56 - 17 

      x = 39

d) 22 - x = 16

       x = 22 - 16 

       x = 6 

x + 25 = 53

       x= 53 - 25

       x =  28

x - 56 = 28

       x = 28 + 56 

       x = 84

56 - x = 17 

       x = 56 - 17

        x = 39

22 - x = 16

       x = 22 - 16

        x = 6