a) \(2\frac{1}{4}x-9\frac{1}{4}=20\)
\(\frac{9}{4}x=20+\frac{37}{4}\)
\(\frac{9}{4}x=\frac{80}{4}+\frac{37}{4}\)
\(\frac{9}{4}x=\frac{117}{4}\)
\(x=\frac{117}{4}:\frac{9}{4}\)
\(x=\frac{117}{4}.\frac{4}{9}\)
\(x=13\)
Vậy x=13
a) \(2\frac{1}{4}x-9\frac{1}{4}=20\)
\(\Rightarrow\frac{9}{4}x-\frac{37}{4}=20\)
\(\Rightarrow\frac{9}{4}x=20+\frac{37}{4}\)
\(\Rightarrow\frac{9}{4}x=\frac{117}{4}\)
\(\Rightarrow x=\frac{117}{4}:\frac{9}{4}\)
\(\Rightarrow x=13\)
Vậy x = 13
b) \(0,25x-\frac{1}{5}x=\frac{13}{20}\)
\(\Rightarrow\left(0,25-\frac{1}{5}\right)x=\frac{13}{20}\)
\(\Rightarrow\frac{1}{20}x=\frac{13}{20}\)
\(\Rightarrow x=\frac{13}{20}:\frac{1}{20}\)
\(\Rightarrow x=13\)
Vậy x = 13
\(b,\)\(0,25x-\frac{1}{5}x=\frac{13}{20}\)
\(\Leftrightarrow x\left(0,25-\frac{1}{5}\right)=\frac{13}{20}\)
\(\Rightarrow x.\frac{1}{20}=\frac{13}{20}\)
\(\Rightarrow x=\frac{13}{20}:\frac{1}{20}\)
\(x=13\)
\(a,2\frac{1}{4}x-9\frac{1}{4}=20\)
\(\frac{9}{4}x-\frac{37}{4}=20\)
\(\frac{9}{4}x=\frac{117}{4}\)
\(x=\frac{117}{4}:\frac{9}{4}\)
\(x=13\)
b, \(0,25x-\frac{1}{5}x=\frac{13}{20}\)
\(\frac{1}{4}x-\frac{1}{5}x=\frac{13}{20}\)
\(\left(\frac{1}{4}-\frac{1}{5}\right)x=\frac{13}{20}\)
\(\frac{1}{20}x=\frac{13}{20}\)
\(x=\frac{13}{20}:\frac{1}{20}\)
\(x=13\)
\(0,25x-\frac{1}{5}x=\frac{13}{20}\)
\(\frac{1}{4}x-\frac{1}{5}x=\frac{13}{20}\)
\(x.\left(\frac{1}{4}-\frac{1}{5}\right)=\frac{13}{20}\)
\(x.\left(\frac{5}{20}-\frac{4}{20}\right)=\frac{13}{20}\)
\(\frac{1}{20}x=\frac{13}{20}\)
\(x=\frac{13}{20}:\frac{1}{20}\)
\(x=\frac{13}{20}.20\)
\(x=13\)
vậy x=13
tk cho mk nhá b
