( x - 15 ) x 7 - 270 : 45 = 169

          ( x - 15 ) x 7 - 6  = 169

          ( x - 15 ) x 7       = 175

            x - 15               = 25

                  x                = 40

( x-15 ) x7 - 270 : 45 = 169

( x - 15) x 7               =169  x 45

( x - 15) x 7               =7605

x - 15                       =7605 : 7

x - 15                      =7620

        x                       =7620 + 15

       x                        

( X – 15 ) x 7 - 270 : 45 = 169

( x - 15 ) x 7 - 6 = 169

( x - 15 ) x 7 = 169 + 6

( x - 15 ) x 7 = 175

x - 15 = 175 : 7

x - 15 = 25

x = 25 + 15

x = 40

Vậy x = 40

(X – 15) x 7 - 270 : 45 = 169

=> (x – 15) x 7 - 6  = 169

=> (x – 15) x 7 = 175

=> x – 15 = 25

=> x = 10

Vậy ... 

Chúc bạn học tốt ~

\(a,\left(x-15\right)\times7-270=169\times45\\ \left(x-15\right)\times7-270=7605\\ \left(x-15\right)\times7=7605+270\\ \left(x-15\right)\times7=7875\\ x-15=7875:7\\ x-15=1125\\ x=1125+15\\ x=1140\\ b,64-\left(34\times x-8\right)=4\\ 34\times x-8=64-4\\ 34\times x-8=60\\ 34\times x=60+8\\ 34\times x=68\\ x=68:34\\ x=2\)

(x-15)x7-270:45=169

(x-15) x 7 - 6     = 169

(x - 15 ) x 7        = 169 + 6

( x -15) x 7          = 175

x - 15                  = 175 : 7

x - 15                  = 25

x                         = 25 + 15

x                         = 40

Vậy x = 40

# HOK TỐT #

(x-15) x 7 -270 : 45=169

(x-15) x 7 - 6         =169

(x-15) x 7             = 169+6

(x-15) x 7            =  175

x-15 

Giải:

 ( x - 15 ) x 7 - 270 : 45 = 169

 ( x - 15 ) x 7 - 6 =169

 ( x - 15 ) x 7 = 169 + 6

 ( x - 15 ) x 7 = 175

 x - 15 = 175 : 7

 x - 15 = 25

 x = 25 +15

 x = 40

 Vậy x = 40

(x - 15 )x 7 - 270 : 45 =169

(x-5)x7 -6 =169 

(x-5)x7 = 169 +6 

(X-5)x7 = 175

X-5 = 175:7

X-5 = 25 

X =25+5 

X=30

\(\frac{75}{20-x}=\frac{3}{2}.10\)

\(\frac{75}{20-x}=15\)

\(\Rightarrow\left(20-x\right).15=75\)

\(\Rightarrow20-x=75:15\)

\(\Rightarrow20-x=5\)

\(\Rightarrow x=15\)

vậy \(x=15\)

\(2013x-x=2013.2011+2013\)

\(2012x=2013\left(2011+1\right)\)

\(2012x=2013.2012\)

\(x=2013\)

vậy \(x=2013\)

\(\left(x-15\right).7=270:45\)

\(\left(x-15\right).7=6\)

\(x-15=\frac{6}{7}\)

\(x=\frac{6}{7}+15\)

\(x=\frac{111}{7}\)

vậy \(x=\frac{111}{7}\)

\(\left(x-15\right).7=169\)

\(x-15=\frac{169}{7}\)

\(x=\frac{169}{7}+15\)

\(x=\frac{274}{7}\)

vậy \(x=\frac{274}{7}\)

thông cảm đề bài câu cuối ko hiểu

a) (x - 15) × 7 - 270 : 45 = 169

(x - 15) × 7 - 6 = 169

(x - 15) × 7 = 169 + 6

(x - 15) × 7 = 175

x - 15 = 175 : 7

x - 15 = 25

x = 25 + 15

x = 40

b) [(4x + 28) × 3 + 55] : 5 = 35

(4x + 28) × 3 + 55 = 35 × 5

(4x + 28) × 3 + 55 = 175

(4x + 28) × 3 = 175 - 55

(4x + 28) × 3 = 120

4x + 28 = 120 : 3

4x + 28 = 40

4x = 40 - 28

4x = 12

x = 12 : 4

x = 3

c) (455 × x : 2 × 6) : 5 = 31

455 × x : 2 × 6 = 31 × 5

455 × x : 2 × 6 = 155

x × 455 : 2 × 6 = 155

x × 1365 = 155

x = 155 : 1365

x = 31/273

d) 128 × x - 12 × x - 16 × x = 520800

(128 - 12 - 16) × x = 520800

100 × x = 520800

x = 520800 : 100

x = 5208

e) (x × 0,25 + 2022) × 2023 = (50 + 2022) × 2023

(x × 0,25 + 2022) × 2023 = 2072 × 2023

(x × 0,25 + 2022) × 2023 = 4191656

x × 0,25 + 2022 = 4191656 : 2023

x × 0,25 + 2022 = 2072

x × 0,25 = 2072 - 2022

x × 0,25 = 50

x = 50 : 0,25

x = 200

f) 4 × x + 100 = x + 280

4 × x - x = 280 - 100

(4 - 1) × x = 180

3 × x = 180

x = 180 : 3

x = 60

g) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 7450

x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450

100 × x + 100 × 101 : 2 = 7450

100 × x + 5050 = 7450

100 × x = 7450 - 5050

100 × x = 2400

x = 2400 : 100

x = 24

(y-18)x7-270:45=169

(y-18)x7-6=169

(y-18)x7=175

y-18=175:7

y-18=25

y=25+18

y=43

    Vậy y=43

(y - 18) x 7 - 270 : 45 = 169

(y - 18) x 7 - 6           = 169 

(y - 18) x 7                = 169 + 6

(y - 18) x 7                = 175

 y - 18                       = 175 : 7

 y - 18                       = 25

 y - 18                       = 25 + 18

 y                              = 43

  (36 x 15 x 169):(5 x 18 x 13)

= (18 x 2 x 3 x 5 x 13 x 13):(5 x 18 x 13)

= 2x3x13x(5 x 18 x 13):(5 x 18 x 13)

= 2 x 3 x 13

= 78