\(\left(2\frac{4}{5}.x-50\right):\frac{2}{3}=51\)
\(\Leftrightarrow\)\(\frac{14}{5}.x-50=51.\frac{2}{3}=34\)
\(\Leftrightarrow\)\(\frac{14}{5}x=34+50=84\)
\(\Leftrightarrow\)\(x=84:\frac{14}{5}=30\)
Vậy....
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\left(\frac{14}{5}x-50\right)=51\times\frac{2}{3}\)
\(\left(\frac{14}{5}x-50\right)=34\)
\(\frac{14}{5}x=34+50\)
\(\frac{14}{5}x=84\)
\(x=84:\frac{14}{5}\)
\(x=30\)
(24/5 . x - 50) : 2/3 = 51
(24/5 . x - 50) = 51 x 2/3 = 34
24/5 . x = 34 + 50 = 84
x = 84 : 24/5 = 35/2
Đáp số: 35/2
\(\left(2\frac{4}{5}\cdot x-50\right):\frac{2}{3}=51\)
\(2\frac{4}{5}\cdot x-50=51\cdot\frac{2}{3}\)
\(2\frac{4}{5}\cdot x-50=34\)
\(2\frac{4}{5}\cdot x=34+50\)
\(2\frac{4}{5}\cdot x=84\)
\(x=84:2\frac{4}{5}\)
\(x=30\)
