第16页 - 江苏版启东中学作业本八年级数学（上下册）

$=\sqrt {3×2÷30}$

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

$=\frac {\sqrt 5}5$

$=\sqrt {15÷30×\frac {4}{3}}$

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

$=\frac {\sqrt 6}3$

$=\sqrt {6×27÷\frac 12}$

$=\sqrt {324}$

$=18$

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

$=\sqrt {32}$

$=4\sqrt 2$

$=4×\sqrt {24÷2÷48}$

$=4×\sqrt {\frac {1}{4}}$

$=4×\frac 12$

$=2$

$=(-\frac 23×\frac 13)×\sqrt {18÷3×27}$

$=-\frac {2}{9}×\sqrt {2×3×3×9}$

$=-\frac {2}{9}×9\sqrt 2$

$=-2\sqrt {2}$

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

$=\frac 34×\sqrt {32}$

$=\frac 34×4\sqrt 2$

$=3\sqrt 2$

$=(1÷\frac {2}{5}×4)×\sqrt {\frac {10}{3}÷\frac {7}{3}×\frac {7}{5}}$

$=10\sqrt 2$

$=\sqrt {a^3· ab÷9a^2b^3}$

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

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

$=(1÷3×\frac 12)×\sqrt {3a^2÷\frac {a}2×\frac {2a}3}$

$=\frac 16×\sqrt {4a^2}$

$=\frac 16×2a$

$=\frac {a}{3}$

$=\sqrt {xy^2÷5y×15x}$

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

$=x \sqrt {3y}$

$=(-\frac 2{b} ×\frac 32÷3)×\sqrt {ab^5×a^3b÷\frac {b}a}$

$=-\frac 1{b}\sqrt {a^5b^5}$

$=-\frac 1{b}×a^2b^2\sqrt {ab}$

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