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電子課本網(wǎng) › 第113頁

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解：???$=(2\sqrt {2})2-(3\sqrt {3})2$???
???$ =8-27$???
???$ =-19$???
解：???$=6+4\sqrt {2}-3\sqrt {2}-4$???
???$ =2+\sqrt {2}$???
解：???$=\sqrt {3}-3\sqrt {5}-\frac {3\sqrt {5}}{5}$???
???$ =\sqrt {3}-\frac {18\sqrt {5}}{5}$???
解：???$=(3\sqrt {5})2-2×3\sqrt {5}×5\sqrt {2}+(5\sqrt {2})2$???
???$ =45-30\sqrt {10}+50$???
???$ =95-30\sqrt {10}$???
解：???$=5\sqrt {2}-2\sqrt {2}+2$???
???$ =3\sqrt {2}+2$???
解：???$=\sqrt {2}+1+3-3\sqrt {2}+2\sqrt {2}$???
???$ =4$???
解：???$=(20\sqrt {3}+2\sqrt {3}-6\sqrt {7})$???
???$÷\sqrt {3}$???
???$ =22-2\sqrt {21}$???
解：???$=4\sqrt {3}+3\sqrt {6}÷\sqrt {2}$???
???$+3+\sqrt {3}-\sqrt {3}-1$???
???$ =4\sqrt {3}-3\sqrt {3}+3+\sqrt {3}-\sqrt {3}-1$???
???$ =2+\sqrt {3}$???
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