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信息發(fā)布者：
解??$： h=\frac {S}{A B} =2 \sqrt {\frac {3}{\sqrt {6}}} =\sqrt {2}$??

解:都不成立。
??$(1) $??結(jié)果是??$ \frac {\sqrt } ；$??
??$(2)$??結(jié)果是??$ \frac {\sqrt } ；$??
??$(3)$??結(jié)果是??$ 2 \sqrt {5} ；$??
??$(4) $??結(jié)果是??$ \frac {\sqrt {a-b}}{a-b} .$??

解??$：(1)\sqrt {\frac {0.8}{2.25}}=\frac {4 \sqrt {5}}{15}$??
??$(2)\sqrt {1 \frac {4}{7}} \div \sqrt {\frac {22}{7}} =\sqrt {\frac {11}{7} \div \frac {22}{7}} =\sqrt {\frac {1}{2}} =\frac {\sqrt {2}}{2}$??
??$(3)$??原式??$=-\frac mn×\frac {0.8\ \mathrm {m^2}\sqrt m}{2n^2}=-\frac {2\ \mathrm {m^3}}{5n^3}\sqrt m；$??
??$(4)\frac {\sqrt {5}}{\sqrt {10\ \mathrm {a}}} =\frac {\sqrt {5} ·\sqrt {10\ \mathrm {a}}}{\sqrt {10\ \mathrm {a}} ·\sqrt {10\ \mathrm {a}}} =\frac { \sqrt {2\ \mathrm {a}}}{2\ \mathrm {a}}$??


解：由題意得?$2m+3=3m-2，$?
解得?$m=5.$?

解?$：(1)$?原式?$=\sqrt {2\ \mathrm {a}}+4 \sqrt {2\ \mathrm {a}} =5 \sqrt {2\ \mathrm {a}}$?
?$(2)$?原式?$=m \sqrt {m}+2\ \mathrm {m} \sqrt {m} =3\ \mathrm {m} \sqrt {m}$?
?$(3)$?原式?$=\frac {\sqrt {x}}{3}+4 \sqrt {x}-\sqrt {x} =\frac {10 \sqrt {x}}{3}$?

解?$：(1)-2 \sqrt {\frac {a^3}{16}}-\frac {a}{4} \sqrt {4a}=-a \sqrt {a}=-9 \sqrt {9}=-27$?
?$(2)$?原式?$ =5 \sqrt {5} ≈5 ×2.236 ≈11.18 $?
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