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\(\dfrac{a}{b}=\dfrac{5}{9}:\dfrac{2}{3}\)
\(\dfrac{a}{b}=\dfrac{5}{6}\)
\(\dfrac{a}{b}=4+\dfrac{2}{3}\)
\(\dfrac{a}{b}=\dfrac{14}{3}\)
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a, \(\dfrac{a}{b}=\dfrac{4}{7}+\dfrac{1}{2}=\dfrac{8+7}{14}=\dfrac{15}{14}\)
b, \(\dfrac{a}{b}=\dfrac{5}{6}+\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{10+3+4}{12}=\dfrac{17}{12}\)
\(a:\dfrac{a}{b}-\dfrac{1}{2}=\dfrac{4}{7}\\ \dfrac{a}{b}=\dfrac{4}{7}+\dfrac{1}{2}\\ \dfrac{a}{b}=\dfrac{8}{14}+\dfrac{7}{14}\\ \dfrac{a}{b}=\dfrac{15}{14}\\ b:\dfrac{a}{b}-\dfrac{1}{4}-\dfrac{1}{3}=\dfrac{5}{6}\\ \dfrac{a}{b}-\left(\dfrac{1}{4}+\dfrac{1}{3}\right)=\dfrac{5}{6}\\ \dfrac{a}{b}-\dfrac{7}{12}=\dfrac{5}{6}\\ \dfrac{a}{b}=\dfrac{5}{6}+\dfrac{7}{12}\\ \dfrac{a}{b}=\dfrac{17}{12}\)
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Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
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a) \(\frac{3}{4}-\frac{1}{6}-\frac{a}{b}=\frac{1}{2}\)
\(\frac{7}{12}-\frac{a}{b}=\frac{1}{2}\)
\(\frac{a}{b}=\frac{7}{12}-\frac{1}{2}\)
\(\frac{a}{b}=\frac{1}{12}\)
b) \(\frac{a}{b}\times\frac{1}{4}\times\frac{2}{5}=\frac{1}{7}\)
\(\frac{a}{b}\times\frac{1}{10}=\frac{1}{7}\)
\(\frac{a}{b}=\frac{1}{7}:\frac{1}{10}\)
\(\frac{a}{b}=\frac{10}{7}\)
c) \(\frac{1}{3}:\frac{a}{b}=\frac{2}{3}:\frac{4}{3}\)
\(\frac{1}{3}:\frac{a}{b}=\frac{1}{2}\)
\(\frac{a}{b}=\frac{1}{3}:\frac{1}{2}\)
\(\frac{a}{b}=\frac{3}{2}\)
\(\dfrac{a}{b}.\dfrac{3}{4}+\dfrac{2}{5}=2\)
\(\dfrac{a}{b}=\left(2-\dfrac{2}{5}\right):\dfrac{3}{4}=\dfrac{32}{15}\)
32/15 bạn nhá k đúng cho mình nhé