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4)
![sqrt{45 times 25} = 15 sqrt{5} sqrt{45 times 25} = 15 sqrt{5}](https://tex.z-dn.net/?f=+sqrt%7B45+times+25%7D+%3D+15+sqrt%7B5%7D+)
6)
![sqrt{(89 - 80) times (89 + 80)} sqrt{(89 - 80) times (89 + 80)}](https://tex.z-dn.net/?f=+sqrt%7B%2889+-+80%29+times+%2889+%2B+80%29%7D+)
![sqrt{9 times 169} sqrt{9 times 169}](https://tex.z-dn.net/?f=+sqrt%7B9+times+169%7D+)
![3 times 13 = 39 3 times 13 = 39](https://tex.z-dn.net/?f=3+times+13+%3D+39)
8)
![sqrt{(54 - 45) times (54 + 45)} sqrt{(54 - 45) times (54 + 45)}](https://tex.z-dn.net/?f=+sqrt%7B%2854+-+45%29+times+%2854+%2B+45%29%7D+)
![sqrt{9 times 99} = 9 sqrt{11} sqrt{9 times 99} = 9 sqrt{11}](https://tex.z-dn.net/?f=+sqrt%7B9+times+99%7D++%3D+9+sqrt%7B11%7D+)
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