Question

1/3*x+3/4*x-75%=-51/4

Answer 1

\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=\frac{-51}{4}\)

\(x.\left(\frac{1}{3}+\frac{3}{4}\right)-\frac{3}{4}=\frac{-51}{4}\)

\(x.\left(\frac{4}{12}+\frac{9}{12}\right)=\frac{-51}{4}+\frac{-3}{4}\)

\(x.\frac{13}{12}=\frac{-54}{4}=\frac{-27}{2}\)

\(x=\frac{-27}{2}:\frac{13}{12}=\frac{-27}{2}.\frac{2}{13}=\frac{-27.2}{2.13}=\frac{-27.1}{1.13}=\frac{-27}{13}\)

Answer 2

Xin lỗi cho mình sửa lại

\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=\frac{-51}{4}\)

\(x.\left(\frac{1}{3}+\frac{3}{4}\right)-\frac{3}{4}=\frac{-51}{4}\)

\(x.\left(\frac{4}{12}+\frac{9}{12}\right)=\frac{-51}{4}+\frac{3}{4}=\frac{-48}{4}\)

\(x.\frac{13}{12}=-12\)

\(x=-12:\frac{13}{12}=12.\frac{12}{13}=\frac{-12.12}{13}=\frac{-144}{13}\)