![\displaystyle \frac{21\sqrt{5} }{-7\sqrt{125} } \\\\125 \ can \ be \ written \ as \ 5 \times 5 \times 5\\\\= \frac{21\sqrt{5} }{-7\sqrt{ 5 \times 5 \times 5} } \\\\= -\frac{3\sqrt{5} }{\sqrt{5^2} \times \sqrt{5} } \\\\= -\frac{3\sqrt{5} }{5\sqrt{5} } \\\\= -\frac{3}{5} \\\\\rule[225]{225}{2}](/tpl/images/2609/0011/f645f.png)
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