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7 tháng 12 2021

\(3\left(x-6\right)-5^3=2\left(x-8\right)-1\)

\(\Leftrightarrow3x-18-125=2x-16-1\)

\(\Leftrightarrow x=126\)

Vậy: ...

nhiều quá :((

\(a,2\left(x-5\right)-3\left(x+7\right)=14\)

\(2x-10-3x-21=14\)

\(-x-31=14\)

\(-x=45\)

\(x=45\)

\(b,5\left(x-6\right)-2\left(x+3\right)=12\)

\(5x-30-2x-6=12\)

\(3x-36==12\)

\(3x=48\)

\(x=16\)

\(c,3\left(x-4\right)-\left(8-x\right)=12\)

\(3x-12-8+x=0\)

\(4x-20=0\)

\(4x=20\)

\(x=5\)

Cố nốt nha bn ! 

19 tháng 3 2020

cảm ơn, bn nha:)))

mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???

25 tháng 6 2018

\(1,\\ x+\dfrac{1}{2}=-\dfrac{5}{3}\\ x=-\dfrac{5}{3}-\dfrac{1}{2}\\ x=-\dfrac{13}{6}\\ Vậyx=-\dfrac{13}{6}\)

\(2,\\ \dfrac{1}{3}-x=\dfrac{3}{5}\\ x=\dfrac{1}{3}-\dfrac{3}{5}\\ x=-\dfrac{4}{15}\\ Vậyx=-\dfrac{4}{15}\)

\(3,\\ 3-4+x=\dfrac{7}{2}\\ -1+x=\dfrac{7}{2}\\ x=\dfrac{7}{2}+1\\ x=\dfrac{9}{2}\\ Vậyx=\dfrac{9}{2}\)

\(4,\\ x-\dfrac{4}{3}=-\dfrac{7}{9}\\ x=-\dfrac{7}{9}+\dfrac{4}{3}\\ x=\dfrac{15}{27}\\ Vậyx=\dfrac{15}{27}\)

\(5,\\ x-\left(-\dfrac{7}{3}\right)=\dfrac{5}{6}\\ x=\dfrac{5}{6}-\dfrac{7}{3}\\ x=-\dfrac{27}{18}\\ Vậyx=-\dfrac{27}{18}\)

\(6,\\ x-\dfrac{1}{5}=\dfrac{9}{10}\\ x=\dfrac{9}{10}+\dfrac{1}{5}\\ x=\dfrac{11}{10}\\ Vậyx=\dfrac{11}{10}\)

\(7,\\ x+\dfrac{5}{12}=\dfrac{3}{8}\\ x=\dfrac{3}{8}-\dfrac{5}{12}\\ x=-\dfrac{1}{24}\\ Vậyx=-\dfrac{1}{24}\)

\(8,\\ x+\dfrac{5}{4}=\dfrac{7}{6}\\ x=\dfrac{7}{6}-\dfrac{5}{4}\\ x=-\dfrac{9}{24}\\ Vậyx=-\dfrac{9}{24}\)

\(9,\\ x-\dfrac{2}{7}=\dfrac{1}{35}\\ x=\dfrac{1}{35}+\dfrac{2}{7}\\ x=\dfrac{11}{35}\\ Vậyx=\dfrac{11}{35}\\ 10,\\ x-\dfrac{1}{5}=-\dfrac{7}{10}\\ x=-\dfrac{7}{10}+\dfrac{1}{5}\\ x=-\dfrac{1}{2}\\ Vậyx=-\dfrac{1}{2}\)

18 tháng 2 2021

ahiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii hãy ấn a

28 tháng 7 2018

a, x + \(\dfrac{1}{5}\) = \(\dfrac{5}{6}\)

x = \(\dfrac{5}{6}\) - \(\dfrac{1}{5}\)

x = \(\dfrac{19}{30}\)

b, x - \(\dfrac{3}{5}=\dfrac{6}{7}\)

x = \(\dfrac{6}{7}+\dfrac{3}{5}\)

x = \(1\dfrac{16}{35}\)

c, - x - \(\dfrac{7}{5}=\dfrac{-8}{9}\)

- x = \(\dfrac{-8}{9}+\dfrac{7}{5}\)

x = \(\dfrac{23}{45}\)

d, \(\dfrac{3}{8}-x=\dfrac{2}{3}\)

\(x=\dfrac{3}{8}-\dfrac{2}{3}\)

\(x=\dfrac{-7}{24}\)

e, \(|x-\dfrac{8}{9}|=\dfrac{1}{3}\)

\(x=\dfrac{1}{3}+\dfrac{8}{9}\)

\(x=\dfrac{-11}{9}\)

3 tháng 8 2018

Hiệu giữa SBT mới và cũ là:

353 – 23 = 330

Hiệu số phần bằng nhau là:

3-1 = 2 phần

Số bị trừ cũ là: 330 : 2 = 165

Số trừ cũ là : 165- 23 = 142

2: \(=\dfrac{-2}{75}+\dfrac{5}{39}=\dfrac{33}{325}\)

3: \(=\dfrac{6}{11}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{6}{11}\)

4: \(=\dfrac{7}{19}\left(\dfrac{5}{13}+\dfrac{8}{13}-1\right)=-2\cdot\dfrac{7}{19}=-\dfrac{14}{19}\)

5: \(=\dfrac{2}{7}\left(\dfrac{4}{23}-\dfrac{27}{23}+1\right)=0\)

6: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)

(x-1)/3=8/6?????

1) |x + 2| = 4

\(\Leftrightarrow\orbr{\begin{cases}x+2=4\\x+2=-4\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2\\x=-6\end{cases}}\)

2) 3 – |2x + 1| = (-5)

\(\Leftrightarrow\left|2x+1\right|=8\Leftrightarrow\orbr{\begin{cases}2x+1=8\\2x+1=-8\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{7}{2}\\x=\frac{-9}{2}\end{cases}}\)

3) 12 + |3 – x| = 9

\(\Leftrightarrow\left|3-x\right|=-3\)(vô lí)

=>\(x=\varnothing\) 

25 tháng 2 2020

1) I x+2 I=4

\(\Rightarrow\orbr{\begin{cases}x+2=4\\x+2=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=-6\end{cases}}}\)

2) \(3-|2x+1|=-5\)

\(\Leftrightarrow|2x+1|=8\)

\(\Leftrightarrow\orbr{\begin{cases}2x+1=8\\2x+1=-8\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=7\\2x=-9\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{7}{2}\\x=\frac{-9}{2}\end{cases}}}\)

3) \(12+|3-x|=9\)

\(\Leftrightarrow|3-x|=-3\)(vô lí vì I 3-x I \(\ge\)0)

30 tháng 3 2020

1/ 10(X-7)-8(X+5)=6(-5)+24
10x - 70 - 8x - 40 = -30 +24
2x - 110 = -6
2x = 104
x=52

2/ 8(X-|-7|)-6(X-2)=|-8|.6-50
8(x - 7) - 6(x-2) = 8.6 - 50
8x - 56 - 6x +12 =48 -50
2x - 44 = -2
2x = 42
x=21

3/ 2(4X-8)-7(3+X)=|-4|(3-2)
8x-16 - 21 - 7x = 4.1
x-37=4
x=41

4/ 12(X-4)=6(x-2)-16(X+3)=7|-4|
12x - 48 = 6x - 12 - 16x -48 =7.4
12x - 48 = 28
12x=76
x=19/3

5/ 4(X-5)-7(5-X)+10(5-X)=-3
4x - 20 -35 +7x + 50 -10x = -3
x - 5 = -3
x = -2
Chúc bạn học tốt!

11 tháng 1 2023

a) \(\dfrac{5}{8}-\left(x+\dfrac{3}{4}\right)=\dfrac{7}{6}\)

     \(-x-\dfrac{3}{4}=\dfrac{13}{24}\)

    \(-x=\dfrac{31}{24}\)

\(\Rightarrow x=\dfrac{-31}{24}\)

b) \(\left(x-\dfrac{3}{4}\right)+\dfrac{3}{2}=\dfrac{11}{3}\)

    \(x-\dfrac{3}{4}=\dfrac{13}{6}\)

    \(x=\dfrac{35}{12}\)

c) \(\left(x+\dfrac{1}{2}\right)-\dfrac{5}{8}=2\)

    \(x+\dfrac{1}{2}=\dfrac{21}{8}\)

    \(x=\dfrac{17}{8}\)

d) \(\dfrac{11}{2}-\left(\dfrac{4}{5}+x\right)=2-\dfrac{1}{3}\)

    \(\dfrac{11}{2}-\left(\dfrac{4}{5}+x\right)=\dfrac{5}{3}\)

    \(-\dfrac{4}{5}-x=\dfrac{-23}{6}\)

    \(-x=\dfrac{-91}{30}\)

\(\Rightarrow x=\dfrac{91}{30}\) 

 

11 tháng 1 2023

`5/8-(x+3/4)=7/6`

`=> x+3/4 = 5/8 -7/6`

`=> x+3/4 = -13/24`

`=>x= -13/24 -3/4`

`=>x= -13/24 - 18/24`

`=>x= -31/24`

`-----------`

`(x-3/4)+3/2+11/3`

`=11/3` hả bn?

`----------`

`(x+1/2)-5/8=2`

`=>x+1/2=2+5/8`

`=>x+1/2= 16/8+5/8`

`=> x+1/2=21/8`

`=>x=21/8-1/2`

`=>x= 21/8 - 4/8`

`=>x= 17/8`

`---------`

`11/2-(4/5+x)=2-1/3`

`=> 11/2-(4/5+x)=6/3-1/3`

`=> 11/2-(4/5+x)=5/3`

`=>4/5+x=11/2-5/3`

`=>4/5+x=23/6`

`=>x=23/6-4/5`

`=>x= 91/30`

11 tháng 1 2023

=11/3 nha mk ghi nhầm

23 tháng 6 2016

Ta có: 4 - |x - 5| = 0

=> | x - 5 | = 4

<=> x - 5 = 4

       x - 5 = -4

<=> x = 4 + 5

       x = -4 + 5

<=> x = 9

       x = 1

23 tháng 6 2016

1) x=9 hoặc x=1

2)x=2 hoặc x=8/3

3)x=6 hoặc x=2