-x - 94 + 62 - 99 = 95 + 62 - 99.

=> -x - 94 + 62 - 99 = 157 - 99.

=> -x - 94 + 62 - 99 = 58.

=> -x - 94 + 62 = 58 + 99

=> -x - 94 + 62 = 157.

=> -x - 94 = 157 - 62.

=> -x - 94 = 95.

=> -x = 95 + 94

=> -x = 189.

Vậy -x = 189.

#Học tốt.

Lạy ông đi quá lạy bà đi lại, ai có thể cho con xin cái đáp án k:>

\(B.\dfrac{-3}{94}\)

\(\frac{\left(x^{95}+x^{94}\right)+.....+\left(x+1\right)}{\left(x^{31}+x^{30}\right)+.....+\left(x+1\right)}=\frac{x^{94}\left(x+1\right)+......+\left(x+1\right)}{x^{30}\left(x+1\right)+.....+\left(x+1\right)}=\frac{x^{94}+x^{92}+....+x^2+1}{x^{30}+x^{28}+....+x^2+1}=\frac{\left(x^2+1\right)x^{92}+x^{88}\left(x^2+1\right).....+\left(x^2+1\right)}{\left(x^2+1\right)x^{28}+\left(x^2+1\right)x^{24}+....+\left(x^2+1\right)}=\frac{x^{92}+x^{88}+......+x^4+1}{x^{28}+x^{24}+.....+x^4+1}=\frac{x^{88}\left(x^4+1\right)+x^{80}\left(x^4+1\right)+....+\left(x^4+1\right)}{x^{24}\left(x^4+1\right)+x^{16}\left(x^4+1\right)+.....+\left(x^4+1\right)}=\frac{x^{88}+x^{80}+....+1}{x^{24}+x^{16}+...+1}\)

\(=\frac{x^{80}\left(x^8+1\right)+x^{64}\left(x^8+1\right)+.....+\left(x^8+1\right)}{x^{16}\left(x^8+1\right)+\left(x^8+1\right)}=\frac{x^{80}+x^{64}+.....+1}{x^{16}+1}=\frac{x^{64}\left(x^{16}+1\right)+.....+x^{16}+1}{x^{16}+1}=x^{64}+x^{32}+1\)

Ta có : \(\dfrac{2x+5}{95}+\dfrac{2x+6}{94}+\dfrac{2x+7}{93}=\dfrac{2x+93}{7}+\dfrac{2x+94}{6}+\dfrac{2x+95}{5}\)

\(\Leftrightarrow\dfrac{2x+5}{95}+\dfrac{2x+6}{94}+\dfrac{2x+7}{93}-\dfrac{2x+93}{7}-\dfrac{2x+94}{6}-\dfrac{2x+95}{5}=0\)

\(\Leftrightarrow\dfrac{2x+5}{95}+1+\dfrac{2x+6}{94}+1+\dfrac{2x+7}{93}+1-\dfrac{2x+93}{7}-1-\dfrac{2x+94}{6}-1-\dfrac{2x+95}{5}-1=0\)

\(\Leftrightarrow\dfrac{2x+100}{95}+\dfrac{2x+6}{94}+\dfrac{2x+7}{93}-\dfrac{2x+100}{7}-\dfrac{2x+100}{6}-\dfrac{2x+100}{5}=0\)

\(\Leftrightarrow\left(2x+100\right)\left(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}-\dfrac{1}{7}-\dfrac{1}{6}-\dfrac{1}{5}\right)=0\)

Thấy : \(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}-\dfrac{1}{7}-\dfrac{1}{6}-\dfrac{1}{5}\ne0\)

\(\Rightarrow2x+100=0\)

\(\Leftrightarrow x=-50\)

Vậy ...

Ta có: \(\dfrac{2x+5}{95}+\dfrac{2x+6}{94}+\dfrac{2x+7}{93}=\dfrac{2x+93}{7}+\dfrac{2x+94}{6}+\dfrac{2x+95}{5}\)

\(\Leftrightarrow\dfrac{2x+5}{95}+1+\dfrac{2x+6}{94}+1+\dfrac{2x+7}{93}+1=\dfrac{2x+93}{7}+1+\dfrac{2x+94}{6}+1+\dfrac{2x+95}{5}+1\)

\(\Leftrightarrow\dfrac{2x+100}{95}+\dfrac{2x+100}{94}+\dfrac{2x+100}{93}=\dfrac{2x+100}{7}+\dfrac{2x+100}{6}+\dfrac{2x+100}{5}\)

\(\Leftrightarrow\left(2x+100\right)\left(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}\right)=\left(2x+100\right)\left(\dfrac{1}{7}+\dfrac{1}{6}+\dfrac{1}{5}\right)\)

\(\Leftrightarrow\left(2x+100\right)\left(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}\right)-\left(2x+100\right)\left(\dfrac{1}{7}+\dfrac{1}{6}+\dfrac{1}{5}\right)=0\)

\(\Leftrightarrow\left(2x+100\right)\left(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}-\dfrac{1}{7}-\dfrac{1}{6}-\dfrac{1}{5}\right)=0\)

mà \(\dfrac{1}{95}+\dfrac{1}{94}+\dfrac{1}{93}-\dfrac{1}{7}-\dfrac{1}{6}-\dfrac{1}{5}\ne0\)

nên 2x+100=0

\(\Leftrightarrow2x=-100\)

hay x=-50

Vậy: S={-50}

a, 3.(37 - \(x\)) - 56 = 1

   3.(37 - \(x\)) = 1 + 56

   3.(37 - \(x\)) = 57

       37 - \(x\) = 57 : 3

       37 - \(x\) = 19

               \(x\) = 37 - 19

                \(x\) = 18

b, 95 - (2\(x\) - 1).4 = 14

           (2\(x\) - 1).4 = 95 - 14

           (2\(x\) - 1).4 = 81

             2\(x\) - 1 = 81 : 4

             2\(x\)      = \(\dfrac{81}{4}\) - 1

             2\(x\)     = \(\dfrac{85}{4}\)

              \(x\)    = \(\dfrac{85}{4}\) : 2

               \(x\)    = \(\dfrac{85}{8}\)

c, 

-45 + (\(x\) - 15) = 23

- 45 + \(x\) - 15 = 23

 - (45 + 15) + \(x\) = 23

   - 60 + \(x\)         = 23

              \(x\)        = 23 + 60

              \(x\)      = 83 

\(\frac{x-1}{95}+\frac{x-2}{94}=\frac{x-3}{93}+\frac{x-4}{92}\)

\(\Rightarrow\frac{x-1}{95}+\frac{x-2}{94}-\frac{x-3}{93}-\frac{x-4}{92}=0\)

\(\Rightarrow\left(\frac{x-1}{95}-1\right)+\left(\frac{x-2}{94}-1\right)-\left(\frac{x-3}{93}-1\right)-\left(\frac{x-4}{92}-1\right)=0\)

\(\Rightarrow\frac{x-96}{95}+\frac{x-96}{94}-\frac{x-96}{93}-\frac{x-96}{92}=0\)

\(\Rightarrow\left(x-96\right)\left(\frac{1}{95}+\frac{1}{94}-\frac{1}{93}-\frac{1}{92}\right)=0\)

\(\Rightarrow x-96=0\left(vì\frac{1}{95}+\frac{1}{94}-\frac{1}{93}-\frac{1}{92}\ne0\right)\)

\(=>x=96\)

cho mình hỏi là viết phân số làm sao vậy

A=[(38+17)+125]+29

A=175+29

A=204

B=312.3

B=936

C=1+1+1+1+1

C=5

D=(125:5).(36:9)

D=25.4

D=100

\(\frac{x+1}{96}+\frac{x+2}{95}=\frac{x+3}{94}+\frac{x+4}{93}\)

\(\Rightarrow\left(\frac{x+1}{96}+1\right)+\left(\frac{x+2}{95}+1\right)=\left(\frac{x+3}{94}+1\right)+\left(\frac{x+4}{93}+1\right)\)

\(\Rightarrow\frac{x+97}{96}+\frac{x+97}{95}=\frac{x+97}{94}+\frac{x+97}{93}\)

\(\Rightarrow\frac{x+97}{96}+\frac{x+97}{95}-\frac{x+97}{94}-\frac{x+97}{93}=0\)

\(\Rightarrow\left(x+97\right)\left(\frac{1}{96}+\frac{1}{95}-\frac{1}{94}-\frac{1}{93}\right)=0\)

Mà \(\frac{1}{96}+\frac{1}{95}-\frac{1}{94}-\frac{1}{93}\ne0\)

\(\Rightarrow x+97=0\)

\(\Rightarrow x=-97\)

Vậy x = -97

Có : \(\frac{x+1}{96}+\frac{x+2}{95}=\frac{x+3}{94}+\frac{x+4}{93}\)

\(\Leftrightarrow\)\(\left(\frac{x+1}{96}+1\right)+\left(\frac{x+2}{95}+1\right)\)= \(\left(\frac{x+3}{94}+1\right)+\left(\frac{x+4}{93}+1\right)\)

\(\Leftrightarrow\) \(\frac{x+97}{96}+\frac{x+97}{95}=\frac{x+97}{94}+\frac{x+97}{93}\)

\(\Leftrightarrow\) \(\frac{x+97}{96}+\frac{x+97}{95}-\frac{x+97}{94}-\frac{x+97}{93}=0\)

\(\Leftrightarrow\) \(\left(x+97\right)\left(\frac{1}{96}+\frac{1}{95}-\frac{1}{94}-\frac{1}{93}\right)=0\)

\(\Leftrightarrow\) \(\left(x+97\right)=0\) ( \(\frac{1}{96}+\frac{1}{95}-\frac{1}{94}-\frac{1}{93}\)) \(\ne0\)

\(\Leftrightarrow\)\(x=-97\)

Vậy \(x=-97\)