Question
Answer
$$2\cdot\dfrac{1}{2}-7\dfrac{\sqrt{3}}{2}=\dfrac{2-7\sqrt{3}}{2}$$
Explanation
| $$ \begin{aligned}2\cdot\frac{1}{2}-7\frac{\sqrt{3}}{2}& \xlongequal{ }1-7 \cdot \frac{\sqrt{3}}{2} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{2-7\sqrt{3}}{2}\end{aligned} $$ | |
| ① | $$ 1-7 \cdot \frac{\sqrt{3}}{2}
= 1 \cdot \color{blue}{\frac{ 2 }{ 2}} - \frac{7\sqrt{3}}{2} \cdot \color{blue}{\frac{ 1 }{ 1}}
= \frac{2-7\sqrt{3}}{2} $$ |
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