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B

$解：原式?=\sqrt{20×5}?$

$?=10?$

$解:原式?=-12\sqrt{2×8}?$

$?=-12×4?$

$?=-48?$

$解：原式?=\sqrt{6a^3×\frac {3a}2}?$

$?=\sqrt{9a^4}?$

$?=3a^2?$

$解：原式?=\sqrt{25×3}?$

$?=5\sqrt{3}?$

$解：原式?=\sqrt{9x^2 ·x}?$

$? =3x\sqrt{x}?$

$解：原式?=\sqrt{36a^4b^2 ·2b }?$

$? =6a^2b\sqrt{2b}?$

$解：原式?=\sqrt{(49+32)(49-32)}?$

$? =\sqrt{81×17}?$

$? =9\sqrt{17}$

$ 3\sqrt{30}$

C

$ -3≤m≤0$

$解：原式?=\sqrt{\frac 34×\frac {8}3}?$

$?=\sqrt{2}?$

$解：原式?=\frac 23×\frac 12×\sqrt{12×3×20}?$

$?=\frac {1}{3}×12\sqrt{5}?$

$?=4\sqrt{5}?$

$解：原式=\sqrt{\frac m 6×96m}?$

$\ \ \ \ \ \ \ \ ?=4m?$

$解：原式?=\sqrt{5ab ·45a^3b}?$

$? =15a^2b?$

$解：原式?=\sqrt{36×2a}?$

$? =6\sqrt{2a}?$

$ 解：原式?=\sqrt{(51+49)×(51-49)}?$

$? =\sqrt{100×2}?$

$?=10\sqrt{2}?$

$解：原式?=\frac {\sqrt{0.09}×\sqrt{121}}{\sqrt{0.36}×\sqrt{100}}?$

$? =\frac {0.3×11}{0.6×10}?$

$? =\frac {11}{20}$

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