**Q3: **

Simplify the expression .

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**Q4: **

Simplify the expression .

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**Q5: **

Simplify the expression .

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**Q6: **

Simplify the expression .

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**Q7: **

Simplify .

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**Q8: **

Simplify the expression .

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**Q9: **

Simplify the expression .

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**Q10: **

Simplify the expression .

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**Q11: **

Simplify the expression .

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**Q12: **

Simplify .

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**Q13: **

Simplify the expression .

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**Q14: **

Simplify the expression .

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**Q15: **

Simplify .

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**Q16: **

Simplify the expression .

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**Q17: **

Simplify the expression .

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**Q18: **

Simplify the expression .

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**Q19: **

Simplify .

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**Q20: **

Simplify the expression .

**Q21: **

Simplify the expression .

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**Q22: **

Simplify the expression .

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**Q23: **

Simplify the expression .

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**Q24: **

In the following diagram, is the quantity of water in a full bottle and is that in a full glass. The total quantity of water shown in the diagram can be expressed as . Simplify this expression.

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**Q25: **

Simplify .