Subtract, divide the given expressions — task. Mathematics State Board, Class 9.

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1. Subtract the expression

$(11 \sqrt{5} + 6 \sqrt{31})$

$-$

$(7 \sqrt{31} - 5 \sqrt{5})$ .

$16 \sqrt{31} - \sqrt{5}$
$16 \sqrt{5} + (-1) \sqrt{31}$
$-1 \sqrt{5} + (16) \sqrt{31}$

2. Divide the expression

$27 \sqrt{31}$ by

$9 \sqrt{31}$ $=$

$i$ .

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