\(\left(5+\frac{4}{7}\right):x=13\)
\(\frac{39}{7}:x=13\)
\(x=\frac{39}{7}:13\)
\(x=\frac{3}{7}\)
\(\left[5+\frac{4}{7}\right]:x=13\)
\(\Rightarrow\left[\frac{5\cdot7+4}{7}\right]:x=13\)
\(\Rightarrow\frac{39}{7}:x=13\)
\(\Rightarrow x=\frac{39}{7}:13=\frac{39}{7}\cdot\frac{1}{13}=\frac{3}{7}\cdot\frac{1}{1}=\frac{3}{7}\)
\(\left[2,8\cdot x+32\right]:\frac{2}{3}=90\)
\(\Rightarrow\left[2,8\cdot x+32\right]=90\cdot\frac{2}{3}\)
\(\Rightarrow\left[2,8\cdot x+32\right]=60\)
\(\Rightarrow2,8\cdot x+32=60\)
\(\Rightarrow2,8\cdot x=60-32\)
\(\Rightarrow2,8\cdot x=28\)
Đến đây dễ rồi :v
\(\left(2,8.x+32\right):\frac{2}{3}=90\)
\(2,8.x+32=90.\frac{2}{3}\)
\(2,8.x+32=60\)
\(2,8.x=60-32\)
\(2,8.x=28\)
\(x=28:2,8\)
\(x=10\)
\(\left(5+\frac{4}{7}\right)\text{ : }x=13\)
\(\left(\frac{35}{7}+\frac{4}{7}\right)\text{ : }x=13\)
\(\frac{39}{7}\text{ : }x=13\)
\(x=\frac{39}{7}\text{ : }13\text{ }\)
\(x=\frac{39}{7}\cdot\frac{1}{13}\)
\(x=\frac{3}{7}\)
\(\left(2,8\cdot x+32\right)\text{ : }\frac{2}{3}=90\)
\(2\frac{4}{5}\cdot x+32=90\cdot\frac{2}{3}\)
\(\frac{14}{5}\cdot x+32=60\)
\(\frac{14}{5}\cdot x=60-32\)
\(\frac{14}{5}\cdot x=28\)
\(x=28\text{ : }\frac{14}{5}\)
\(x=28\cdot\frac{5}{14}\)
\(x=10\)
