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第104頁

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?$解:原式???=-\sqrt {\frac {3}{4}×\frac {8}{3}×56}???$?
?$??? =-\sqrt {112}???$?
?$??? =-4\sqrt {7}?$?
?$解:原式???=-8×(-\frac {1}{4})×\sqrt {35×\frac {10}{7}}???$?
?$??? =2\sqrt {50}???$?
?$??? =10\sqrt {2}$?
?$ 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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