Đề bài: Tìm x
\(\frac{2}{3}x-0.4=\frac{1}{5}\)
\(\frac{2}{3}x-0=\frac{1}{5}\)
\(\frac{2}{3}x=\frac{1}{5}\)
\(x=\frac{1}{5}\div\frac{2}{3}\)
\(x=\frac{1}{5}.\frac{3}{2}\)
\(x=\frac{3}{10}\)
Vậy \(x=\frac{3}{10}.\)
Bài làm:
\(\frac{2}{3}x-0.4=\frac{1}{5}\)
\(\Leftrightarrow\frac{2}{3}x-\frac{2}{5}=\frac{1}{5}\)
\(\Leftrightarrow\frac{2}{3}x=\frac{3}{5}\)
\(\Leftrightarrow x=\frac{3}{5}\div\frac{2}{3}\)
\(\Rightarrow x=\frac{9}{10}\)
Học tốt!!!!
\(\frac{2}{3}x-0,4=\frac{1}{5}\)
\(\frac{2}{3}x=\frac{1}{5}+0,4\)
\(\frac{2}{3}x=\frac{3}{5}\)
\(x=\frac{9}{10}\)
2\3\x -0,4 =1\5
2\3x-4\10 =1\5
2\3x = 1\5+4\10
2\3x = 3\5
x = 3\5:2\3
x = 9\10
2\3x -0,4 = 1\5
2\3x - 4\10=1\5
2\3x =1\5+4\10
2\3x =3\5
x = 3\5:2\3
x =9\10
\(\frac{2}{3}x-0,4=\frac{1}{5}\)
\(\frac{2}{3}x-\frac{2}{5}=\frac{1}{5}\)
\(\frac{2}{3}x=\frac{3}{5}\)
\(x=\frac{9}{10}\)
Vậy \(x=\frac{9}{10}\)
2/3x= 1/5+0.4
2/3x= 3/5
x=3/5:2/3
x=9/10
\(\frac{2}{3}x-0,4=\frac{1}{5}\)
\(\frac{2}{3}x-\frac{4}{10}=\frac{1}{5}\)
\(\frac{2}{3}x-\frac{2}{5}=\frac{1}{5}\)
\(\frac{2}{3}x=\frac{1}{5}+\frac{2}{5}\)
\(\frac{2}{3}x=\frac{3}{5}\)
\(x=\frac{3}{5}:\frac{2}{3}=\frac{3}{5}.\frac{3}{2}\)
\(x=\frac{9}{10}\)
Vậy \(x=\frac{9}{10}\)
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