a) \(\dfrac{5}{y}=\dfrac{1}{2}\)
\(y=\dfrac{5\times2}{1}=10\)
b) \(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{7}{5}\)
\(y=7\)
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\(\dfrac{5}{y}=\dfrac{1}{2}\\ =>y=5.2:1=10\)
\(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\\ =>\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{42}{25}.\dfrac{5}{6}=\dfrac{7}{5}\\ =>y=\dfrac{7}{5}.5=7\)
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a) \(\dfrac{5}{y}=\dfrac{1}{2}\)
\(\Rightarrow y=5\cdot2:1=10\)
b) \(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}=\dfrac{7}{5}\)
\(\dfrac{y}{5}=\dfrac{7}{5}\)
\(\Rightarrow y=7\)
Đúng 2
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