To evaluate the expression \( \frac{4mn}{-2p} \) when \( m = \frac{1}{2} \), \( n = -3 \), and \( p = 3 \), we start by substituting the values of \( m \), \( n \), and \( p \) into the expression.
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Substitute the values: \[ m = \frac{1}{2}, \quad n = -3, \quad p = 3 \]
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Substitute into the expression: \[ \frac{4 \cdot \frac{1}{2} \cdot (-3)}{-2 \cdot 3} \]
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Calculate the numerator: \[ 4 \cdot \frac{1}{2} = 2 \] Then: \[ 2 \cdot (-3) = -6 \] Therefore, the numerator is \( -6 \).
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Calculate the denominator: \[ -2 \cdot 3 = -6 \]
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The expression now looks like this: \[ \frac{-6}{-6} \]
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Simplify the fraction: \[ \frac{-6}{-6} = 1 \]
Thus, the value of the expression \( \frac{4mn}{-2p} \) is \( \boxed{1} \).