$4\cdot\frac{1}{2}+8\cdot\frac{1}{4}\cdot1+2^2\cdot6\cdot\frac{2}{3}-4$
$a+a+1\sqrt{a^{4}-a^{2}-2a-1}$
$2\left(4a-1\right)+a$
$-45-54+-24$
$\left(ax^2-by\right)^2$
$-4-15\cdot15$
$\frac{\sqrt{2o-\sqrt{30}}}{\sqrt{5}}$
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