a: \(=\dfrac{8}{15}\cdot\dfrac{1}{2}=\dfrac{4}{15}\)
b: \(=\dfrac{2}{15}\cdot\dfrac{1}{2}=\dfrac{1}{15}\)
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a \(\dfrac{8}{15}\)x\(\dfrac{1}{2}\)=\(\dfrac{4}{15}\)
b \(\dfrac{2}{15}\)x\(\dfrac{1}{2}\)=\(\dfrac{1}{15}\)
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