Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sqrt{ 125-4 \sqrt{ 45-2 \sqrt{ 80 } } }$$

Evaluate

$\sqrt{-4\sqrt{45-8\sqrt{5}}+125}\approx 10.206494745$

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