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12. (1)求下列各数的算术平方根：
$ \textcircled{1} 0.09; \textcircled{2} \frac{1}{196} \textcircled{3} (-6)^{2} $
$ \textcircled{4} 3 \frac{1 6}{2 5} ; \textcircled{5} 0 ; \textcircled{6} \sqrt {1 0 0 0 0}.(2) $求下列各式的值：$ \textcircled{1} \sqrt{1 4 4} ; \textcircled{2} \sqrt{(-13)^{2}} ; \textcircled{4} \sqrt{\frac{2 5}{1 2 1}} \textcircled{5} \sqrt{81} $的算术平方根；$ \textcircled{6} \sqrt{(-\frac{25}{36})^{2}} $的平方根.
$ \textcircled{1} 0.09; \textcircled{2} \frac{1}{196} \textcircled{3} (-6)^{2} $
$ \textcircled{4} 3 \frac{1 6}{2 5} ; \textcircled{5} 0 ; \textcircled{6} \sqrt {1 0 0 0 0}.(2) $求下列各式的值：$ \textcircled{1} \sqrt{1 4 4} ; \textcircled{2} \sqrt{(-13)^{2}} ; \textcircled{4} \sqrt{\frac{2 5}{1 2 1}} \textcircled{5} \sqrt{81} $的算术平方根；$ \textcircled{6} \sqrt{(-\frac{25}{36})^{2}} $的平方根.
答案
12.解:(1)①$0.3$.②$\frac{1}{14}$.③$6$.④$\frac{\sqrt{91}}{5}$.⑤$0$.⑥$10$.
(2)①$12$.②$13$.③$-0.4$.④$\frac{5}{11}$.⑤$3$.⑥$\pm\frac{5}{6}$.
(2)①$12$.②$13$.③$-0.4$.④$\frac{5}{11}$.⑤$3$.⑥$\pm\frac{5}{6}$.
