$337.62 + 8.591 + 34.4 = ?$

The simplified value of the following expression is: $\frac{1}{\sqrt{11-2 \sqrt{30}}}-\frac{3}{\sqrt{7-2 \sqrt{10}}}-\frac{4}{\sqrt{8+4 \sqrt{3}}}$

$15 \frac{2}{3} \times 3 \frac{1}{6} + 6 \frac{1}{3} = 11 \frac{7}{18} + ?$

If $x^{2}+y^{2}+z^{2}+2=2(y-x)$,then the value of $x^{3}+y^{3}+z^{3}$ is equal to

What approximate value will come in the place of the question mark $(?)$ in the following expression? (You are not expected to calculate the exact value.)
$\frac{989}{34} \div \frac{65}{869} \times \frac{515}{207} = ?$

If $a * b = 2a - 3b + ab$,then $3 * 5 + 5 * 3$ is