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

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1. Subtract the expression

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

$-$

$(9 \sqrt{31} - 8 \sqrt{11})$ .

$-3 \sqrt{11} + (19) \sqrt{31}$
$19 \sqrt{31} - \sqrt{11}$
$19 \sqrt{11} + (-3) \sqrt{31}$

2. Divide the expression

$36 \sqrt{47}$ by

$12 \sqrt{47}$ $=$

$i$ .

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