A. ![\sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt[2]{28}](https://tex.z-dn.net/?f=+%5Csqrt%7B20%7D+%2B+%5Csqrt%7B125%7D+%2B+%5Csqrt%7B20%7D+%2B+%5Csqrt%5B2%5D%7B28%7D+ "\sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt[2]{28}")
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![\sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt[2]{28} \\ = \sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt{28} \\ = \sqrt{4.5} + \sqrt{25.5} + \sqrt{4.5} + \sqrt{4.7} \\ = \sqrt{4} . \sqrt{5} + \sqrt{25} . \sqrt{5} + \sqrt{4} . \sqrt{5} + \sqrt{4} . \sqrt{7} \\ = 2 \sqrt{5} + 5 \sqrt{5} + 2 \sqrt{5} + 2 \sqrt{7} \\ = (2+5+2) \sqrt{5} + 2 \sqrt{7} \\ = 9 \sqrt{5} + 2 \sqrt{7}](https://tex.z-dn.net/?f=+%5Csqrt%7B20%7D+%2B++%5Csqrt%7B125%7D+%2B++%5Csqrt%7B20%7D+%2B+++%5Csqrt%5B2%5D%7B28%7D++%5C%5C+%3D+%5Csqrt%7B20%7D+%2B+%5Csqrt%7B125%7D+%2B+%5Csqrt%7B20%7D+%2B+%5Csqrt%7B28%7D++%5C%5C+%3D++%5Csqrt%7B4.5%7D+%2B++%5Csqrt%7B25.5%7D+%2B++%5Csqrt%7B4.5%7D+%2B++%5Csqrt%7B4.7%7D++%5C%5C+%3D++%5Csqrt%7B4%7D+.+%5Csqrt%7B5%7D+%2B++%5Csqrt%7B25%7D+.+%5Csqrt%7B5%7D+%2B++%5Csqrt%7B4%7D+.+%5Csqrt%7B5%7D+%2B++%5Csqrt%7B4%7D+.+%5Csqrt%7B7%7D++%5C%5C+%3D+2++%5Csqrt%7B5%7D+%2B+5+%5Csqrt%7B5%7D+%2B+2+%5Csqrt%7B5%7D+%2B+2+%5Csqrt%7B7%7D++%5C%5C+%3D+%282%2B5%2B2%29++%5Csqrt%7B5%7D+%2B+2++%5Csqrt%7B7%7D++%5C%5C+%3D+9+%5Csqrt%7B5%7D+%2B+2+%5Csqrt%7B7%7D+ "\sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt[2]{28} \\ = \sqrt{20} + \sqrt{125} + \sqrt{20} + \sqrt{28} \\ = \sqrt{4.5} + \sqrt{25.5} + \sqrt{4.5} + \sqrt{4.7} \\ = \sqrt{4} . \sqrt{5} + \sqrt{25} . \sqrt{5} + \sqrt{4} . \sqrt{5} + \sqrt{4} . \sqrt{7} \\ = 2 \sqrt{5} + 5 \sqrt{5} + 2 \sqrt{5} + 2 \sqrt{7} \\ = (2+5+2) \sqrt{5} + 2 \sqrt{7} \\ = 9 \sqrt{5} + 2 \sqrt{7}")
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