a) 13-[7-(x+8)]=11         

    [7-(x+8)]=13-11

    [7-(x+8)]=2

    (x+8)=7-2

    (x+8)=5

     x=5-8

     x=-3

b. 1500(x-7)=0

x-7=0

x=7

c. (2x-4)(48-12x)=0

2x-4=0 hoặc 48-12x=0

x=2 hoặc x=4

d. (x+12)(x-1)=0

x+12=0 hoặc x-1=0

x=-12 hoặc x=1

bài 2 :

a . 128-3(x+4)=23

3(x+4)=105

x+4=35

x=31

b. [(14X+26).3+55]:5=35

(14x+26).3+55=175

(14x+26).3=120

14x+26=40

14x=14

x=1

d. 720:[41-(2X-5)]=23.5

41-(2x-5)=720:(23.5)

41-(2x-5)=144/23

2x-5=799/23

2x=914/23

x=457/23

b, 1500.(x – 7) = 0

<=>1500x-10500=0

<=>1500x=10500

<=>x=7

Vậy x=7

c,(2.x – 4).(48 – 12.x) = 0

\(\Leftrightarrow\)\(\left\{{}\begin{matrix}2x-4=0\\48-12x=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x=4\\12x=48\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\x=4\end{matrix}\right.\)

Vậy x=2 hoặc x=4

d, (x + 12).(x – 1) =0

\(\Leftrightarrow\left\{{}\begin{matrix}x+12=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-12\\x=1\end{matrix}\right.\)

Vậy x=-12 hoặc x=1

Bài 2:

a) 128- 3(x+ 4) = 23

\(\Leftrightarrow\)128-(3x+12)=23

\(\Leftrightarrow\)128-3x-12=23

\(\Leftrightarrow\)116-3x=23

\(\Leftrightarrow\)3x=116-23

\(\Leftrightarrow\)3x=93

\(\Leftrightarrow\)x=31

Vậy x=31

b) [(14x+ 26). 3+ 55]: 5= 35

\(\Leftrightarrow\)(14x+ 26). 3+ 55=175

\(\Leftrightarrow\)42x+78+55=175

\(\Leftrightarrow\)42x+133=175

\(\Leftrightarrow\)42x=175-133

\(\Leftrightarrow\)42x=42

\(\Leftrightarrow\)x=1

Vậy x=1

d, 720: [41- (2x- 5)]= 23. 5

\(\Leftrightarrow\)720: 41- (2x- 5)=115

\(\Leftrightarrow\)41-(2x- 5)=720:115

\(\Leftrightarrow\)41-(2x- 5)=\(\dfrac{144}{23}\)

\(\Leftrightarrow\)2x-5=\(\dfrac{799}{23}\)

\(\Leftrightarrow\)2x=\(\dfrac{914}{23}\)

\(\Leftrightarrow\)x=\(\dfrac{457}{23}\)

Vậy x=\(\dfrac{457}{23}\)

1) 14x-8x=10+5

x(14-8)=15

x6=15

x=15/6

2)5x-3x=30-15

2x=15

x=15/2

3)làm tương tự

1) x=2,5

2) x=7,5

3) x=4

4) x=7/3

5) x=8,25

128 - 3 ( x + 4 ) = 23

         3 ( x + 4 ) = 128 - 23

         3 ( x + 4 ) = 105

              x + 4   = 105 : 5

              x + 4   = 35

              x         = 35 - 4

              x         = 31

128 - 3 ( x + 4 ) = 23

         3 ( x + 4 ) = 128 - 23

         3 ( x + 4 ) = 105

              x + 4   = 105 : 5

              x + 4   = 35

              x         = 35 - 4

              x         = 31

k mik nha

14x - 2 . 7² = 42

14x=140

x=10

ghi rõ cách làm cho mình nha!!!

kết quả =

b,14x10+x+5x100+yx10+7

647+x+yx10

645+2+x+yx+y

x+y+2chia hết cho 3

vì x là chữ số nên 8<x+y +2<20

x+y+2 có thể= 18,15,12,9

nếu x+y+2=18=>{x+y=16,2xx-y=11

                        =>3xx=27,x+y=16=>x=9,y=7

nếu x+y+2=15=>{x+y=13,2xx-y=11

                       =>3xx=24,x+=13=>x=8,y=5

nếu x+y+2=12=>[x+y=10,2xx-y=11

                      =>3xx=21,x+y=10=>x=7,y=3

nếu x+y+2=9=>{x+y=7,2xx-y=11

                     =>3xx=18,x+y=7=>x=6,y=1

1 / 5 x 2 ² + ( x + 3 ) = 5 ²

     20  +      ( x + 3 ) = 25

                     x + 3   = 5

                          x    = 2

2 / 3 ² x 2 + ( x + 25 ) = 10 ²

     18       + ( x + 25 ) = 100

                     x  + 25  = 82

                            x    = 57

3 / 2 ³ x 5 - ( x + 3 ² ) = 10

     40       - ( x + 9 )   = 10

                    x + 9     = 30

                         x      = 21

4 / 7 ² - 7 x ( 13 - x ) = 14

     49 - 7 x ( 13 - x ) = 14

           7 x ( 13 - x )  = 35

                    13 - x   = 5

                          x    = 8

5 / 14 x - 2 x 7 ² = 2 x 3  x 7

     14 x - 98       = 42

     14 x              = 140

          x              = 10

1/ 5 x 2² + ( x + 3 ) = 5²

2/ 3² x 2 + ( x + 25 ) = 10²

3/ 2³ x 5 - ( x + 3² ) = 10

4/ 7² - 7 x ( 13 - x ) = 14

5/ 14x - 2 x 7² = 2 x 3 x 7

1 / 5 x 2 ² + ( x + 3 ) = 5 ²

     20  +      ( x + 3 ) = 25

                     x + 3   = 5

                          x    = 2

2 / 3 ² x 2 + ( x + 25 ) = 10 ²

     18       + ( x + 25 ) = 100

                     x  + 25  = 82

                            x    = 57

3 / 2 ³ x 5 - ( x + 3 ² ) = 10

     40       - ( x + 9 )   = 10

                    x + 9     = 30

                         x      = 21

4 / 7 ² - 7 x ( 13 - x ) = 14

     49 - 7 x ( 13 - x ) = 14

           7 x ( 13 - x )  = 35

                    13 - x   = 5

                          x    = 8

5 / 14 x - 2 x 7 ² = 2 x 3  x 7

     14 x - 98       = 42

     14 x              = 140

          x              = 10

 nhé !

a, ( x + 1 ) + ( x + 2 ) + ... + ( x + 199 ) = 0

x + 1 + x + 2 + ... + x + 199 = 0

( x + x + ... + x ) + ( 1 + 2 + ... + 199 ) = 0 

199x + 19900 = 0

199x = 0 - 19900

199x = -19900

x = -19900 : 199

x = -100

Vậy ...

b, ( x - 30 ) + ( x - 29 ) + ( x - 28 ) = 11

x - 30 + x - 29 + x - 28 = 11

( x + x + x ) - ( 30 + 29 + 28 ) = 11

3x -  87 = 11

3x = 11 + 87 

3x = 98

x = \(\frac{98}{3}\)

Vậy ... 

a. => 16-2.(15-x)=10

=> 2.(15-x)=16-10

=> 2.(15-x)=6

=> 15-x=3

=> x=15-3

=> x=12

b. => 49-7.(13-x)=14

=> 7.(13-x)=35

=> 13-x=5

=> x=8

c. => 5x-25=10

=> 5x=10+25

=> 5x=35

=> x=35:5

=> x=7

d. =>14x-98=42

=> 14x=42+98

=> 14x=140

=> x=140:14

=> x=10.