第26页 - 启东中学作业本八年级数学人教版

$解:原式=\frac {y^{6}}{27x^{6}}$

$解:原式=\frac {a^{9}b^{3}y^{6}}{8x^{3}}$

$解:原式=\frac {27m^{6}}{n^{6}}×\frac {3n^{3}}{m^{3}}$

$=\frac {81m^{3}}{n^{3}}$

$解:原式=\frac {27c^{6}}{64a^{3}b^{9}}×\frac {64a^{12}}{b^{6}c^{6}}$

$=\frac{27a^{9}}{b^{15}}$

$解:原式=16x^{12}y^{16}×y^{3}×\frac {1}{64x^{12}}$

$=\frac {1}{4}y^{19}$

$解:原式=\frac {x^{2}}{y^{2}}×\frac {1}{xy^{4}}×\frac {y^{6}}{x^{3}}$

$=\frac{1}{x^{2}}$

$解:原式=\frac {24a^{2}}{b^{3}}×\frac {a^{2}}{4b^{4}c^{2}}$

$=\frac{6a^{4}}{b^{7}c^{2}}$

$解:原式=-\frac {1}{a^{2}b^{3}}×\frac {3b^{2}}{a}×\frac {a^{4}b^{2}}{6}$

$=-\frac{1}{2}ab$

$解:原式=\frac {m^{2}}{n^{4}p^{2}}×\frac {n}{2mq}$

$=\frac{m}{2n^{3}p^{2}q}$

$解:原式=\frac {1}{4}-3×1×\frac {2}{3}$

$=-1\frac{3}{4}$

$解:原式=\frac {2.2}{4.4}×10^{2}$

$=50$

$解:原式=\frac {3^{2}}{3^{2}}×10^{-8}$

$=\frac{1}{10^{8}}$