第25页 - 启东中学作业本八年级数学人教版

$解:原式=\frac{4a^{4}b^{2}}{9c^{2}}$

$ 解:原式=-\frac {27x^{3}y^{3}}{8}$

$解:原式=\frac {2}{3x^{3}}×x^{2}$

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

$解:原式=\frac {a^{5}}{b^{5}}×\frac {1}{a^{4}b}$

$=\frac {a}{b^{6}}$

$解:原式=-\frac {9a^{2}c^{2}}{4b^{2}}×\frac {1}{9ac^{2}}$

$=-\frac{a}{4b^{2}}$

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

$=-\frac{a^{8}}{b^{3}c^{3}}$

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

$=\frac{8}{9}$

$解:原式=-6xy^{2}×\frac {8x^{3}}{27y^{6}}×\frac {4y^{2}}{9x^{2}}$

$=-\frac{64x^{2}}{81y^{2}}$

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

$=-\frac {y}{x}$

$ 解:原式=-\frac {x^{2}}{y^{2}}×\frac {y^{3}}{x^{3}}×x^{2}y^{2}$

$=-xy^{3}$

$解:原式=-\frac {4a^{2}b^{6}}{c^{4}d^{2}}×\frac {b^{3}}{6a^{2}}×\frac {27c^{3}}{b^{6}}$

$=-\frac {18b^{3}}{cd^{2}}$

$解:原式=\frac {a^{4}}{(b-a)^{4}}×(a+b)(a-b)×\frac {(a-b)^{3}}{a^{3}b^{3}}$

$=\frac {a^{2}+ab}{b^{3}}$