第16页 - 江苏版启东中学作业本八年级数学（上下册）

$=\sqrt {3×2÷30}$

$=\sqrt {\frac {1}{5}}$

$=\frac {\sqrt 5}5$

$=\sqrt {15÷30×\frac {4}{3}}$

$=\sqrt {\frac {2}{3}}$

$=\frac {\sqrt 6}3$

$=\sqrt {6×27÷\frac {1}{2}}$

$=\sqrt {2×3×27×2}$

$=18$

$=\sqrt {18÷\frac {3}{4}×\frac {4}{3}}$

$=\sqrt {32}$

$=4\sqrt 2$

$=2\sqrt {6}×\frac 4{\sqrt 2}×\frac 1{4\sqrt 3}$

$=2$

$=\frac 23×3\sqrt 2×\frac 1{-\sqrt 3}×\frac 13×3\sqrt 3$

$=-2\sqrt 2$

$=\frac 32×\frac 12×\sqrt {30×\frac {8}{3}×\frac {2}{5}}$

$=\frac {3}{4} \sqrt {32}$

$=3\sqrt 2$

$=\sqrt {\frac {10}{3}}÷\sqrt {\frac {4}{25}×\frac {7}{3}}×\sqrt {16×\frac {7}{5}}$

$=\sqrt {\frac {10}{3}×\frac {75}{28}×16×\frac {7}{5}}$

$=\sqrt {200}$

$=10\sqrt 2$

$=\sqrt {a^3×ab÷9a^2b^3}$

$=\frac {a}{3b}$

$=\sqrt {3a^2}÷\sqrt {9×\frac {a}2}×\sqrt {\frac 14×\frac {2a}3}$

$=\sqrt {3a^2×\frac 2{9a}×\frac {a}6}$

$=\sqrt {\frac {a^2}9}$

$=\frac {a}3$

$=\sqrt {xy^2÷5y×15x}$

$=\sqrt {3x^2y}$

$=x\sqrt {3y}$

$=\frac 2{b}×b^2\sqrt {ab}×(-\frac 32a\sqrt {ab})÷3\frac {\sqrt {ab}}a$

$=2b\sqrt {ab}×(-\frac 32a)\sqrt {ab}÷3\frac {\sqrt {ab}}a$

$=-a^2b\sqrt {ab}$