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1)
![sqrt{7} times (2 times sqrt{7} ) = 7 times 2 = 14 sqrt{7} times (2 times sqrt{7} ) = 7 times 2 = 14](https://tex.z-dn.net/?f=+sqrt%7B7%7D++times+%282+times++sqrt%7B7%7D+%29+%3D+7+times+2+%3D+14)
2)
![sqrt{13.69 times 4} = 7.4 sqrt{13.69 times 4} = 7.4](https://tex.z-dn.net/?f=+sqrt%7B13.69+times+4%7D++%3D+7.4)
3)
![sqrt{28 times 63} = sqrt{1764} = 42 sqrt{28 times 63} = sqrt{1764} = 42](https://tex.z-dn.net/?f=+sqrt%7B28+times+63%7D++%3D++sqrt%7B1764%7D++%3D+42)
4)
![sqrt{ frac{75}{3} } = sqrt{25} = 5 sqrt{ frac{75}{3} } = sqrt{25} = 5](https://tex.z-dn.net/?f=+sqrt%7B+frac%7B75%7D%7B3%7D+%7D++%3D++sqrt%7B25%7D++%3D+5)
5)
![{2}^{4} times {5}^{2} = 16 times 25 = 400 {2}^{4} times {5}^{2} = 16 times 25 = 400](https://tex.z-dn.net/?f=+%7B2%7D%5E%7B4%7D++times++%7B5%7D%5E%7B2%7D++%3D+16+times+25+%3D+400)
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