48,6 + 29 , 3 = 77,9

10,23 x 2 = 20,46

72- 5,68 = 66,32

0,2268 : 0,18 = 1,26

48,6+29.3=79,9

10,23*2=20,46

72-5,68=66,32

0,2268:0,18=1.26

77.9

20.46

66.32'

1.4175

h nha

\(\left(x.28\right)+45.67=8911\)

\(\left(x.28\right)+3015=8911\)

\(x.28=8911-3015\)

\(x.28=5896\)

\(x=5896:28\)

\(x=\frac{1474}{7}\)

Vậy \(x=\frac{1474}{7}\)

Bài 1 : 

67 x 126 - 67 x 84 - 41 x 67 - 67

= 67 x 126 - 67 x 84 - 41 x 67 - 67 x 1

= 67 x ( 126 - 84 - 41 - 1 )

= 67 x 0

= 0

Bài 2 :

( x + 3 ) + ( x + 5 ) + (  x + 7 ) +.... + ( x + 45 ) = 1210

( x + x + x +.....+ x ) + ( 3 + 5 + 7 +.... + 45 )   = 1210

X x 22           + 528                                    = 1210

                      X x 22                                 = 1210 - 528

                      X x 22                                 = 682

                            X                                  = 682 : 22

                            X                                 =  31

\(\sqrt{\frac{2}{134}\frac{4}{45346}\hept{\begin{cases}6436\\ttery\\5er\end{cases}}5346\orbr{\begin{cases}6436\\7758\end{cases}}6436^26346436346643\hept{\begin{cases}6346\\6346\end{cases}}\sqrt{64376756}\frac{ }{ }\hept{\begin{cases}\\\end{cases}}\hept{\begin{cases}\\\\\end{cases}}\orbr{\begin{cases}\\\end{cases}}\frac{ }{ }\hept{\begin{cases}\\\end{cases}}}\)

1 

67*126-67*84-41*67-67

=67*(126-84-41-1)

=67*0

=0

2,

Sô x là (45-3):2+1=22

Ta có (đề bài)

=>(x+x+x+ ....+x)+(3+5+...+45)=1210

=>22x + 528=1210

22x=682

x=31

a) x + 285 = 2094

       x = 2094 - 285

       x = 1809

b) x - 45 = 5605

      x = 5605 + 45

      x = 5650

c) 6000 - x = 2000

             x = 6000 - 2000

             x = 4000

a)128-(x+56)=15

x+56=128-15

x+56=113

x=113-56

x=57

b)45+(34-x)=67

34-x=67-45=22

x=34-22

x=12

`@` `\text {Ans}`

`\downarrow`

`a)`

`x \div ( 8,4 + 16,6 ) = 1,8 \times 3`

`x \div 25 = 5,4`

`x = 5,4 \times 25`

`x = 135`

Vậy, `x = 135.`

`b)`

`x \div ( 91,5 - 83,6) = 45`

`x \div 7,9 = 45`

`x = 45 \times 7,9`

`x = 355,5`

Vậy, `x = 355,5`

`c)`

`x \div ( 34 - 24,7) = 207`

`x \div 9,3 = 207`

`x = 207 \times 9,3`

`x =1925,1`

Vậy, `x = 1925,1.`

Tìm x: 

a) \(x:\left(8,4+16,6\right)=1,8\times3\)

\(x:\left(8,4+16,6\right)=5,4\)

\(x:25=5,4\)

\(x=5,4\times25\)

\(x=135\)

b) \(x:\left(91,5-83,6\right)=45\)

\(x:7,9=45\)

\(x=45\times7,9\)

\(x=355,5\)

c) \(x:\left(34-24,7\right)=207\)

\(x:9,3=107\)

\(x=107\times9,3\)

\(x=995,1\)

Sửa câu c: 

c) \(x:\left(34-24,7\right)=207\)

\(x:9,3=207\)

\(x=207\times9,3\)

\(x=1925,1\)

Nãy mik nhìn nhầm.

a) 67 x 3 + 67 x 7

= 67 x (3 + 7)

= 67 x 10

= 670

b) 45 x 6 + 45 x 4

= 45 x (6 + 4)

= 45 x 10

= 450

c) 27 x 6 + 73 x 6

= 6 x (27 + 73)

= 6 x 100

= 600

a) x = 3

b) x = 53

c) x = 2024

d) x = 6