Bài 3)
\(\left(\dfrac{1}{4}+y\right)\times\dfrac{1}{2}=\dfrac{2}{5}\)
\(\dfrac{1}{4}+y=\dfrac{2}{5}:\dfrac{1}{2}\)
\(\dfrac{1}{4}+y=\dfrac{2}{5}\times2\)
\(\dfrac{1}{4}+y=\dfrac{4}{5}\)
\(y=\dfrac{4}{5}-\dfrac{1}{4}\)
\(y=\dfrac{11}{20}\)
\(y\times\dfrac{2}{3}-\dfrac{2}{3}=\dfrac{9}{12}\)
\(y\times\dfrac{2}{3}-\dfrac{2}{3}=\dfrac{3}{4}\)
\(y\times\dfrac{2}{3}=\dfrac{3}{4}+\dfrac{2}{3}\)
\(y\times\dfrac{2}{3}=\dfrac{17}{12}\)
\(y=\dfrac{17}{12}:\dfrac{2}{3}\)
\(y=\dfrac{17}{12}\times\dfrac{3}{2}=\dfrac{17}{8}\)
Đúng 4
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4 và 5
