Question

Tìm x biết

a.7/2x+3/4=-3/10

b. (8 4/5x-50)÷40%=51

Answer 1

\(a,\frac{7}{2}x+\frac{3}{4}=\frac{-3}{10}\)

\(\frac{7}{2}x=\frac{-21}{20}\)

\(x=\frac{-3}{10}\)

\(b,\left(8\frac{4}{5}x-50\right):40\%=51\)

\(8\frac{4}{5}x-50=\frac{102}{5}\)

\(\frac{44}{5}x=\frac{352}{5}\)

\(x=8\)

Answer 2

a,\(\frac{7}{2}x+\frac{3}{4}=-\frac{3}{10}\)

\(\frac{7}{2}x=-\frac{21}{20}\)

\(x=-\frac{3}{10}\)

b,\(\left(8\frac{4}{5}x-50\right)\div40\%=51\)

\(\left(8\frac{4}{5}x-50\right)\div\frac{2}{5}=51\)

\(8\frac{4}{5}x-50=\frac{102}{5}\)

\(8\frac{4}{5}x=\frac{352}{5}\)

\(\frac{44}{5}x=\frac{352}{5}\)

\(x=8\)