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第104頁(yè)

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解:原式???$=-8×(-\frac {1}{4})×\sqrt {35×\frac {10}{7}}$???
???$ =2\sqrt {50}$???
???$ =10\sqrt {2}$???
解:原式???$=-\sqrt {\frac {3}{4}×\frac {8}{3}×56}$???
???$ =-\sqrt {112}$???
???$ =-4\sqrt {7}$???
??$2\sqrt{2}$??
??$2\sqrt{3}$??
??$3\sqrt{2}$??
??$3\sqrt{3}$??
??$4\sqrt{2}$??
解:原式
???$=3\sqrt {6}$???
解:原式
???$=4\sqrt {10}$???
解:原式
???$=20\sqrt {5}$???
解:原式
???$=\sqrt {(25+24)(25-24)}$???
???$ =\sqrt {49}=7$???
解:原式???$=x2y\sqrt {xy}$???
解:原式???$=\sqrt {x(x2+2xy+y2)}$???
???$ =\sqrt {x(x+y)2)}$???
???$ =(x+y)\sqrt {x}$???
解:原式???$=2×4\sqrt {15×6}$???
???$ =8\sqrt {90}$???
???$ =24\sqrt {10}$???
解:原式???$=\sqrt {a^4b}$???
???$ =a2\sqrt $???
解:原式???$=2\sqrt {5a×10a}$???
???$ =2\sqrt {50a2}$???
???$ =10\sqrt {2}a$???

解:原式???$=3×2×\sqrt {5a×8b}$???
???$ =12\sqrt {10ab}$???
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