Question

Bài 8 : Tìm x , biết : 

\(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

Answer 1

\(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

\(\Leftrightarrow\frac{3\times3+1}{3}x+\frac{16\times4+3}{4}=-13,25\)

\(\Leftrightarrow\frac{9+1}{3}x+\frac{64+3}{4}=-13,25\)

\(\Leftrightarrow\frac{10}{3}x+\frac{67}{4}=-13,25\)

\(\Leftrightarrow\frac{10}{3}x+16,75=-13,25\)

\(\Leftrightarrow\frac{10}{3}x=-13,25-16,75\)

\(\Leftrightarrow\frac{10}{3}x=-30\)

\(\Leftrightarrow x=-30\div\frac{10}{3}\)

\(\Leftrightarrow x=\frac{-30}{1}\times\frac{3}{10}\)

\(\Leftrightarrow x=\frac{-90}{10}\)

\(\Leftrightarrow x=-9\)