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=>(2,8x-50):2/3=51
=>2,8x-50=34
=>2,8x=84
=>x=84/2,8=30
\(\left[2\dfrac{4}{5}x-50\right]:\dfrac{2}{3}=51\)
\(\left(\dfrac{14}{5}x-50\right)=\dfrac{10}{3}\)
\(\dfrac{14}{5}x=\dfrac{160}{3}\)
\(\Rightarrow x=\dfrac{160}{3}:\dfrac{14}{5}\)
\(\Rightarrow x=\dfrac{400}{21}\)
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\Rightarrow\left(\frac{14}{5}x-50\right)=51.\frac{2}{3}\)
\(\Rightarrow\frac{14}{5}x-50=34\)
\(\Rightarrow\frac{14}{5}x=34+50\)
\(\Rightarrow\frac{14}{5}x=84\)
\(\Rightarrow x=84:\frac{14}{5}\)
\(\Rightarrow x=84.\frac{5}{14}\)
\(\Rightarrow x=30\)
Vậy \(x=30\)
Chúc bạn học tốt !!!
(\(\frac{24}{5}\). x - 50 ) : \(\frac{2}{3}\) = 51
\(\frac{24}{5}\) . x - 50 = 51 . \(\frac{2}{3}\)
\(\frac{24}{5}\) . x - 50 = \(\frac{102}{3}\)
\(\frac{24}{5}\) . x - 50 = 34
\(\frac{24}{5}\) . x = 34 + 50
\(\frac{24}{5}\) . x = 84
x = 84 : \(\frac{24}{5}\)
x = \(\frac{2016}{5}\)
\(2\frac{4}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{51}.x=51+50:\frac{2}{3}\)
\(\frac{14}{51}.x=51+75\)
\(\frac{14}{51}.x=126\)
\(x=126:\frac{14}{51}\)
x=459
Vậy x=459
\(\frac{2}{3}.x=\frac{5}{12}=>x=\frac{5}{12}:\frac{2}{3}=\frac{5.3}{12.2}=\frac{15}{24}\)=\(\frac{3}{8}\)
vậy x=3/8
24 hay là 2( số nhân với mẫu rồi cộng tử) rùi đến 4 phần 5
\(\left(2\frac{4}{5}.x-50\right):\frac{2}{3}=51\)
\(\Leftrightarrow\)\(\frac{14}{5}.x-50=51.\frac{2}{3}=34\)
\(\Leftrightarrow\)\(\frac{14}{5}x=34+50=84\)
\(\Leftrightarrow\)\(x=84:\frac{14}{5}=30\)
Vậy....
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\left(\frac{14}{5}x-50\right)=51\times\frac{2}{3}\)
\(\left(\frac{14}{5}x-50\right)=34\)
\(\frac{14}{5}x=34+50\)
\(\frac{14}{5}x=84\)
\(x=84:\frac{14}{5}\)
\(x=30\)
a: \(\Leftrightarrow\left(\dfrac{13}{4}:x\right)\cdot\left(-\dfrac{5}{4}\right)=\dfrac{-10}{6}-\dfrac{5}{6}=\dfrac{-15}{6}=\dfrac{-5}{2}\)
\(\Leftrightarrow\dfrac{13}{4}:x=\dfrac{5}{2}\cdot\dfrac{5}{4}=\dfrac{25}{8}\)
hay \(x=\dfrac{13}{4}:\dfrac{25}{8}=\dfrac{13}{4}\cdot\dfrac{8}{25}=\dfrac{26}{25}\)
b: \(\Leftrightarrow\dfrac{3}{4}:x=\dfrac{11}{36}-\dfrac{1}{4}=\dfrac{2}{36}=\dfrac{1}{18}\)
=>\(x=\dfrac{3}{4}:\dfrac{1}{18}=\dfrac{54}{4}=\dfrac{27}{2}\)
c: \(\Leftrightarrow\left(-\dfrac{6}{5}+x\right):\left(-3.6\right)=-\dfrac{7}{4}+\dfrac{1}{4}\cdot8=\dfrac{1}{4}\)
=>x-6/5=-9/10
=>x=3/10
\(\left(2\dfrac{4}{5}.x-50\right):\dfrac{2}{5}=51\)
\(=>\dfrac{14}{5}.x-50=51.\dfrac{2}{5}\)
\(=>\dfrac{14}{5}.x-50=\dfrac{102}{5}\)
\(=>\dfrac{14}{5}.x=\dfrac{102}{5}+50\)
\(=>\dfrac{14}{5}.x=\dfrac{352}{5}\)
\(=>x=\dfrac{352}{5}:\dfrac{14}{5}=\dfrac{352}{5}.\dfrac{5}{14}\)
\(=>x=\dfrac{176}{7}\)
Vậy...