Let's solve the equations step by step.
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For the first equation: \[ 3 \div 4 = 0.75 \] or as a fraction: \[ 3 \div 4 = \frac{3}{4} \]
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For the second equation: \[ -1 \frac{3}{4} = -\left(1 + \frac{3}{4}\right) = -\frac{4}{4} - \frac{3}{4} = -\frac{7}{4} \]
So, the answers are:
- \(3 \div 4 = 0.75\) or \(\frac{3}{4}\)
- \(-1 \frac{3}{4} = -\frac{7}{4}\)