1 Using suitable identities solve the following algebraic expressions (6.5).
2 Add the following algebraic expressions.
3. 5ab-7ab-6, 3ab- 4 and a+b+ 4ab+7
4. What is the smallest number by which 35721 must be divided so that the quotient is a perfect cube?
5. What is the smallest number by which 107811 must be multiplied so that the product is a perfect cube?
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