71-(33+x)=26

      33+x=71-26

      33+x=45

            x=45-33

            x=12

Vậy x=12

45-(x-9):2=6

     (x-9):2=45-6

     (x-9):2=39

      x-9=39.2

      x-9=78

      x=78+9

      x=87

Vậy x=87

\(77-\left(33+x\right)=26\\ \Rightarrow33+x=77-26=51\\ \Rightarrow x=51-33=18\\ 45-\left(x-9\right):2=6\\ \Rightarrow\left(x-9\right):2=45-6=39\\ \Rightarrow x-9=39\cdot2=78\\ \Rightarrow x=78+9=87\)

a 3x +81

b 3mũ4 .3x = 3mũ7 

c 3x+ 25= 26.2mũ2 + 2.3mũ 0

Hình như có sai sai thật

đáp án ra số lẻ đó pn, kq này nèk: \(\frac{313}{124}\)

\(\dfrac{x+2}{x-2}-\dfrac{2}{x^2-2x}=\dfrac{1}{x}\left(đk:x\ne0,x\ne2\right)\)

\(\Leftrightarrow\dfrac{\left(x+2\right)x-2}{x\left(x-2\right)}=\dfrac{x^2-2x}{x\left(x-2\right)}\)

\(\Leftrightarrow x^2+2x-2=x^2-2x\)

\(\Leftrightarrow4x=2\Leftrightarrow x=\dfrac{1}{2}\)

Cho mình sửa lại nhé:

\(\dfrac{x+2}{x-2}-\dfrac{2}{x^2-2x}=\dfrac{1}{x}\left(đk:x\ne0,x\ne2\right)\)

\(\Leftrightarrow\dfrac{\left(x+2\right)x-2}{x\left(x-2\right)}=\dfrac{x-2}{x\left(x-2\right)}\)

\(\Leftrightarrow x^2+2x-2=x-2\)

\(\Leftrightarrow x^2+x=0\)

\(\Leftrightarrow x\left(x+1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\left(ktm\right)\\x=-1\left(tm\right)\end{matrix}\right.\)

Ta có: |15/32 - x| ≥ 0; |4/25 - y| ≥ 0; |z - 14/31| ≥ 0

=> |15/32 - x| +|4/25 - y|+ |z - 14/31| ≥ 0

Mà |15/32 - x| +|4/25 - y|+ |z - 14/31| < 0

=> x, y, z ∈ \(\varnothing\) 

Bạn phải cho mình biết A và B là bao nhiêu mình mới giải được nhaaaa!!!!!

gợi ý a x 10 =10b

x^2 - 3x - 4=0

x^2 - 3x =0+4

x^2 -3x=4

x.x-3x=4

x.(x-3)=4

Suy ra x>3 và x ko thể bằng 3 

Vậy x xhir có thể là 4

=x^2+x-4x-4

=(x^2+x)-(4x+4)

=x(x+1)-4(x+1)

=(x+1)(x-4)

=>

x=-1

và

x=4

3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25 

= 3/25 x 13/7 + 3/7 x 1/25 

= (3 x 13/7 + 3/7 ) x 1/25 

= 42/7 x 1/25 

= 6 x 1/25 

= 6/25

\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)

\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)

\(=\dfrac{39}{175}+\dfrac{3}{175}\)

\(=\dfrac{39+3}{175}\)

\(=\dfrac{42}{175}\)

\(=\dfrac{6}{25}\)

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{15}{7}\) + \(\dfrac{3}{25}\) \(\times\) \(\dfrac{1}{7}\) - \(\dfrac{2}{7}\times\) \(\dfrac{3}{25}\)

A = \(\dfrac{3}{25}\) \(\times\)( \(\dfrac{15}{7}\) + \(\dfrac{1}{7}-\dfrac{2}{7}\))

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{14}{7}\)

A = \(\dfrac{6}{25}\)

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