电子课本网 第125页

第125页

信息发布者:
A
D
C
$6\sqrt2$
$\frac{\sqrt{6}}{2}$
$\frac{\sqrt{15}}{6}$
2
$ \begin{aligned}解:原式&=\sqrt{\frac{7^2a^2·a}{3^2}} \\ &=\frac{7}{3}a \sqrt{a} \\ \end{aligned}$
$ \begin{aligned}解:原式&= \sqrt{\frac{13}{36}} \\ &=\frac{\sqrt{13}}{6} \\ \end{aligned}$
$ \begin{aligned} 解:原式&=x^2·\frac{\sqrt{2}}{\sqrt{x}} \\ &=x \sqrt{2x} \\ \end{aligned}$
$ \begin{aligned}解:原式&=-12\sqrt{2}×2\sqrt6÷12\sqrt{3} \\ &=-48\sqrt{3}÷12\sqrt{3} \\ &=-4 \\ \end{aligned}$
$ \begin{aligned} 解:原式&=(1×\frac{1}{3}×\frac{2}{3}) \sqrt{30×\frac{5}{8}×\frac{20}{3}} \\ &=\frac{2}{9}×5\sqrt{5} \\ &=\frac{10}{9}\sqrt5 \\ \end{aligned}$
$ \begin{aligned}解:原式&= \sqrt{12÷\frac{27}{2}} \\ &= \sqrt{12×\frac{2}{27}} \\ &= \sqrt{\frac{8}{9}} \\ &= \frac{2\sqrt{2}}{3} \\ \end{aligned}$
$ \begin{aligned}解:原式&= \sqrt{\frac{6x^2}{12x^3y}} \\ &=\sqrt{\frac{1}{2xy}} \\ &=\frac{\sqrt{2xy}}{2xy} \\ \end{aligned}$