$$\begin{aligned} & (b+\sqrt{3})\sqrt{(b-\sqrt{3})^2} = (b+\sqrt{3})|b-\sqrt{3}| \\ & \text{При } b = 1.5: \\ & (1.5+\sqrt{3})|1.5-\sqrt{3}| \\ & \sqrt{3} \approx 1.732 \\ & (1.5 + 1.732)|1.5 - 1.732| = 3.232 \cdot |-0.232| = 3.232 \cdot 0.232 \approx 0.75
\end{aligned}$$
<strong>Ответ: 0,75</strong>