\(\frac{2}{x}=\frac{x}{8}\Rightarrow x^2=16=4^2\Rightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)

\(A=\frac{4116-14}{10290-35}=\frac{4102}{10255}=\frac{2}{5}\)

3, \(\frac{2}{x}\)=\(\frac{x}{8}\)

Suy ra : x . x = 2 . 8

            x² = 16

           x²= 4² hoặc x² = (-4)²

Suy ra x=4 hoặc x=-4

A=\(\frac{4116-14}{10290-35}\)=\(\frac{4102}{10255}\)=\(\frac{2}{5}\)

\(\frac{2}{x}=\frac{x}{8}=>x\cdot x=2\cdot8=>x^2=16\)\(=>x=4;x=-4\)

\(A=\frac{4116-14}{10290-35}=\frac{4102}{10255}=\frac{2}{5}\)

6/3=12/6

B)=0,4 HAY2/5

a. |x+3| = x+3 <=> x + 3 là số dương
<=> x>-3
b. |x-2| = 2-x <=> x - 2 là số âm
<=> x < 2

\(\Rightarrow\left(x+1\right)\times\left(x-1+1\right):2=1225\\ \Rightarrow\left(x+1\right)\times x=1225\times2=2450=49\times50\\ \Rightarrow x=49\)

Ta có: \(\left(x-3\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+9\left(x+1\right)^2=15\)

\(\Leftrightarrow x^3-9x^2+27x-27-x^3+27+9\left(x^2+2x+1\right)=15\)

\(\Leftrightarrow-9x^2+27x+9x^2+18x+9=15\)

\(\Leftrightarrow45x=6\)

hay \(x=\dfrac{2}{15}\)

A= 4116-14

    10290-35

= 294.14 - 14

  35.294 - 35

= 294 . 14

  294 . 35 ghạch 2 số 294

=14

  35

= 2

  5

 phàn B tương tự