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a) \(\frac{7}{10}-y\cdot\frac{3}{4}=\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{1}{2}\)
\(y=\frac{1}{2}:\frac{3}{4}\)
\(y=\frac{1}{2}\cdot\frac{4}{3}\)
\(y=\frac{2}{3}\)
b) \(\frac{5}{6}:\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}:\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}\cdot\frac{4}{3}\)
\(y+\frac{7}{9}=\frac{10}{9}\)
\(y=\frac{10}{9}-\frac{7}{9}\)
\(y=\frac{3}{9}=\frac{1}{3}\)
**** !
a, \(\frac{7}{10}-y\times\frac{3}{4}=\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{1}{2}\)
\(\Rightarrow y=\frac{1}{2}\div\frac{3}{4}\)
\(\Rightarrow y=\frac{1}{3}\)
b, \(\frac{5}{6}\div\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{5}{6}\div\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{10}{9}\)
\(\Rightarrow y=\frac{10}{9}-\frac{7}{9}\)
\(\Rightarrow y=\frac{1}{3}\)
\(y\times\dfrac{5}{4}+y\times\dfrac{3}{4}+y\times\dfrac{1}{5}=29.7\)
\(y\times\left(\dfrac{5}{4}+\dfrac{3}{4}+\dfrac{1}{5}\right)=29,7\)
\(y\times\dfrac{11}{5}=29,7\)
\(y=29,7:\dfrac{11}{5}\)
\(y=\dfrac{27}{2}=13,5\)
dấu . là dấu nhân
\(\dfrac{y\cdot5}{4}+\dfrac{y\cdot3}{4}+\dfrac{y\cdot1}{5}=29,7\)
\(\dfrac{5y}{4}+\dfrac{3y}{4}+\dfrac{y}{5}=29,7\)
\(25y+15y+4y=594\)
\(44y=594\\ y=594:44\\ y=\dfrac{27}{2}=13,5\)