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

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1. Subtract the expression

(11 \sqrt{13} + 8 \sqrt{47})

$-$

(9 \sqrt{47} - 8 \sqrt{13})

2. Divide the expression

30 \sqrt{53}

10 \sqrt{53}

$=$

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6. Subtract, divide the given expressions