Question

 4 x [ X -12 ] = 2 x X + 164

1\(\frac{1}{4}\)x X - \(\frac{3}{5}\)= \(\frac{4}{5}\)x X + 35%

1/ 3 x 5 + 1/5x9 + ... + 1/401 x 405 + X = 2\(\frac{1}{405}\)  

Answer 1

nhanh lên các bạn nhé !

Answer 2

\(4\cdot\left(x-12\right)=2x+164\)

\(\Leftrightarrow4x-48=2x+164\)

\(\Leftrightarrow4x-2x=164+48\)

\(\Leftrightarrow2x=212\Rightarrow x=106\)

Sửa đề : \(\frac{1}{1.5}+\frac{1}{5.9}+...+\frac{1}{401.405}+x=2\frac{1}{405}\)

\(\Leftrightarrow\frac{1}{4}\cdot\left(1-\frac{1}{5}+\frac{1}{5}-\frac{1}{9}+...+\frac{1}{401}-\frac{1}{405}\right)+x=\frac{811}{405}\)

\(\Leftrightarrow\frac{1}{4}\cdot\left(1-\frac{1}{405}\right)+x=\frac{811}{405}\)

\(\Leftrightarrow\frac{1}{4}\cdot\frac{404}{405}+x=\frac{811}{405}\)

\(\Leftrightarrow\frac{101}{405}+x=\frac{811}{405}\Rightarrow x=\frac{142}{81}\)

Answer 3

   4x(X-12)=2xX+164

2x2x(X-12)=2xX+2x82

  2x(2X-24)=2x(X+82)

        2X-24=X+82

            2X=X+82+24

            2X=X+106

             X=106

Answer 4

sửa bạn nhé 1\(\frac{1}{4}\)x X - \(\frac{3}{5}\)= \(\frac{4}{5}\)x X + 75%

Answer 5

\(1\frac{1}{4}\)xX-\(\frac{3}{5}=\frac{4}{5}\)xX+35%

  \(\frac{5}{4}\)xX-\(\frac{3}{5}=\frac{4}{5}\)xX+\(\frac{7}{20}\)

        \(\frac{5}{4}\)xX\(=\frac{4}{5}\)xX+\(\frac{7}{20}+\frac{3}{5}\)

        \(\frac{5}{4}\)xX\(=\frac{4}{5}\)xX+\(\frac{19}{20}\)

         \(\frac{19}{20}\)\(=\frac{5}{4}\)xX-\(\frac{4}{5}\)xX

            \(\frac{19}{20}=\left(\frac{5}{4}-\frac{4}{5}\right)\)xX

            \(\frac{19}{20}=\frac{9}{20}\)xX

                 X\(=\frac{19}{20}:\frac{9}{20}\)

                 X\(=\frac{19}{9}\)