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5 tháng 7 2017

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9 tháng 10 2017

lkl;k

1 tháng 11 2024

a; -2\(x\) - 3.(\(x-17\)) = 34 - 2.( - \(x\) + 25)

    - 2\(x\) - 3\(x\) + 51 = 34 + 2\(x\) - 50

       2\(x\) + 2\(x\) + 3\(x\) = - 34 + 50 + 51

            7\(x\)            = 67

               \(x\)           =  67 : 7

                \(x\)         =  \(\dfrac{67}{7}\)

Vậy \(x\) = \(\dfrac{67}{7}\) 

1 tháng 11 2024

b; 17\(x\) + 3.(- 16\(x\) - 37) = 2\(x\) + 43 - 4\(x\)

    17\(x\) - 48\(x\)  - 111 =  2\(x\) - 4\(x\) + 43

    - 31\(x\) - 2\(x\) + 4\(x\) = 111 + 43

        - \(x\) x (31 + 2 - 4) = 154

        - \(x\) x (33 - 4) =  154

         - \(x\) x 29 = 154

         - \(x\)         = 154 : (-29)

           \(x\)        = - \(\dfrac{154}{29}\)

          Vậy \(x=-\dfrac{154}{29}\) 

4 tháng 7 2018

a,x>7

tích đúng rùi lam tiếp

19 tháng 1 2019

a) 2x + 5 = x - 7

    2x -x   = -7 - 5

    x         = -12

19 tháng 1 2019

b) | x | = | 8 |

    | x | = 8

=> x = 8

   hoặc x = -8

1 tháng 4 2020

giúp mik với

1 tháng 4 2020

tìm số ngyên x :

a) -2x-(x-17)=34-(-x+25)
-2x - x +17 =34 + x -25
-3x + 17 =9 +x
-3x + 17 - 9 -x=0
-4x + 8 = 0
-4x = -8
x =2 

28 tháng 10 2021
Jdjsjsnnsndndndndndnnejejekekeodkndnfndndnnfnfnfnfnndkakwowoeijrhfbd historical đó có bột all of có lúc có là do sốc xó óc đó Úc được xây ff xóc đi h Hà đó ơi clan. Gì ơi có óc cm mà đi mà số of con là clair đó Úc áo
17 tháng 1 2016

1a ,Ta có VT=a-b-c+d=(a+d)-(b+c)=VP(đpcm)

b ta có VT=a+b-a+b+a-c-a-c=2b-2c=2(b-c)=VP (đpcm)

c Ta có VT=b+b-c+a-b+c-b-c+a-a+b+c=b+a+Vp(đpcm)

2,=>(-x-1)(-x+1).3.(-x+5)=0=>x thuộc -1;1;5

b=> x(-2-5)=-49=>-7x=-49=>x=7

c=> 3(x2-9)(x-7)=0=>3(x-3)(x+3)(x-7)=0=>x thuộc -3;3;7

d=>-4(x+5)(9-2x)=0=>x thuộc -5;4,5

17 tháng 1 2016

nhiều quá 

tick nhé

22 tháng 7 2017

b)   \(-2x+\left(-3x\right)+\left(-4x\right)+......+\left(-20x\right)=1254\)

\(\Rightarrow x.\left(-2-3-4-.......-20\right)=1254\)

\(\Rightarrow x.\left[-\left(2+3+4+.....+20\right)\right]=1254\)

\(\Rightarrow x.\left(-209\right)=1254\)

\(\Rightarrow x=1254:\left(-209\right)\)

\(\Rightarrow x=-6\)

c)   \(\left|2x\right|=4\)

\(\Rightarrow\orbr{\begin{cases}2x=4\\2x=-4\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)

d)   \(\left|2x-1\right|=3\)

\(\Rightarrow\orbr{\begin{cases}2x-1=3\\2x-1=-3\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}2x=4\\2x=-2\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}\)

22 tháng 7 2017

Cảm ơn nha ~