\(\left(\dfrac{1}{3}x\right)\div\dfrac{2}{3}=1\dfrac{3}{4}\div\dfrac{2}{5}\)
\(\left(\dfrac{1}{3}x\right)\div\dfrac{2}{3}=\dfrac{7}{4}\div\dfrac{2}{5}\)
\(\left(\dfrac{1}{3}x\right)\div\dfrac{2}{3}=\dfrac{35}{8}\)
\(\left(\dfrac{1}{3}x\right)=\dfrac{35}{8}\times\dfrac{2}{3}\)
\(\dfrac{1}{3}x=\dfrac{35}{12}\)
\(x=\dfrac{35}{4}\)
2.
\(x\div2=y\div\left(-5\right)\)
\(\Rightarrow\dfrac{x}{2}=\dfrac{y}{-5}\)
Áp dụng dãy tỉ số bằng nhau ta có:
\(\dfrac{x}{2}=\dfrac{y}{-5}=\dfrac{x-y}{2-\left(-5\right)}=\dfrac{-7}{7}=-1\)
=>x=-2
y=5
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