a)5x-176-324=5x-500

b)294-7x-125+134=-7x+303

c)130-45+5x-43=47

5x+42=47

x=1

a , 130 - [ 5 . ( 9 - x ) + 43 ] = 47

             [ 5 . ( 9 - x ) + 43 ] = 130 - 47

             [ 5 . ( 9 - x ) + 43 ] = 83

               5 . ( 9 - x )          = 83 - 43

                5 . ( 9 - x )         = 40

                      9 - x            = 40 : 5

                       9 - x           = 8

                            x           = 9 - 8

                            x           = 1

b , [ 2 .(  70 - x ) + 2³ . 3² ] : 2 = 46

     [ 2 . ( 70 - x ) + 8 . 9 ] : 2 = 46

     [ 2 . ( 70 - x ) + 72 ] : 2    = 46

     [ 2 . ( 70 - x ) + 72 ]         = 92

            ( 70 - x ) + 72           = 92  : 2

             ( 70- x ) + 72           = 46

             ( 70 - x )                  = 46 - 72

               70 - x                    = - 26

                      x                    = 70 - ( - 26 )

                       x                   = 70 + 26

                       x                   = 96

Bài dễ như vậy mà cứ phải dựa dẫm thế à

ai chơi bang bang2 thì tích đúng và kết bạn với mình

a.1+3+5+7+...+2x+1=225

[(2x+1-1):2+1]x(2x+1+1):2=225

(x+1)x(2x+2):2=225

(x+1)x(x+1)=225

(x+1)²=225

(x+1)²=15²

x+1=15

x=14

_______________

b. 130-[5.(9-x)+43]=47

    5.(9-x)+43=83

  5.(9-x)=40

9-x=8

x=1

_______________

c.16^x<32⁴

2^4x<2²⁰

=>x∈{0;1;2;3;4}

a: =>(x+1)^2=225

=>x+1=15

=>x=14

b: =>[5*(9-x)+43]=130-47=83

=>5(9-x)=40

=>9-x=8

=>x=1

c: =>2^4x<2^20

=>4x<20

=>0<x<5

a) \(128-3\left(x+4\right)=23\)

\(\Rightarrow3\left(x+4\right)=128-23\)

\(\Rightarrow3\left(x+4\right)=105\)

\(\Rightarrow x+4=105:3\)

\(\Rightarrow x+4=35\)

\(\Rightarrow x=35-4\)

\(\Rightarrow x=31\)

Vậy x = 31

b) \(\left(6x-3^3\right).5^3=3.5^4\)

\(\Rightarrow6x-27=3.5^4:5^3\)

\(\Rightarrow6x-27=15\)

\(\Rightarrow6x=15+27\)

\(\Rightarrow6x=42\)

\(\Rightarrow x=42:6\)

\(\Rightarrow x=7\)

Vậy x = 7

c) \(2448:\left[119-\left(x-6\right)\right]=24\)

\(\Rightarrow119-\left(x-6\right)=2448:24=102\)

\(\Rightarrow x-6=119-102=17\)

\(\Rightarrow x=17+6=23\)

Vậy x = 23

d) \(130-\left[5.\left(9-x\right)+43\right]=47\)

\(\Rightarrow5.\left(9-x\right)+43=130-47=83\)

\(\Rightarrow5.\left(9-x\right)=83-43=40\)

\(\Rightarrow9-x=40:5=8\)

\(\Rightarrow x=9-8=1\)

Vậy x = 1

128 - 3( x+4 ) = 23 

=>  3 (x+4) = 128 -23

=>  3(x+4) = 105

=> x+4 = 105 / 3

=> x+4 = 35

=> x = 35 - 4

=> x = 31 

            Vậy x = 31

Ban giup to may cau sau

a,x+(-45)=(-62)+17

<=>x=(-62)+17+45

<=>x=0

b,x+29=\(|-43|\)-+(-43)

<=>x=43-43-29

<=>x=-29

c,43+(9-21)=317-(x+317)

<=>31=317-x-317

<=>31=-x

<=>-31=x

d, (15-x)+(x-12)=7-(-5-x)

<=>15-x+x-12=7+5+x

<=>3=12+x

<=>-9=x

e, x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}

<=>x-57+42-23-x=13-47-25+32-x

<=>76=-27-x

<=>103=-x

<=>-103=x

f,\(|x|+|-4|=7\)

<=>\(|x|\)+4=7

<=>\(|x|\)=3

<=>x=3 hoặc x=-3

a.  x + (-45) = (-62 ) + 17

b.  x + 29 = /-43/ + (-43)

c.  43 + (9 - 21) = 317 - ( x +317)

d.  (15 - x ) + ( x - 12 ) = 7 - ( -5 + x )

e.  x - { 57 - [ 42 + ( -23 - x ) ] } = 13 - { 47 + [ 25 - ( 32 - x ) ] }