第32页 - 江苏版启东中学作业本七年级数学（上下册）

C

$-\frac {1}{5}$

$\frac {6}{5}$

$-\frac {3}{5}$

$-\frac {2}{3}$

-1

解：原式$=-3×\frac {5}{6}×\frac {9}{5}×\frac {1}{4}$

$=-\frac {9}{8}$

解：原式$=-\frac {5}{3}×\frac {4}{9}×\frac {5}{2}×\frac {3}{25}$

$=-\frac {2}{9}$

解：原式$=(\frac {16}{5}×\frac {25}{16})×(\frac {51}{7}×\frac {21}{51})$

$=5×3$

$=15$

解：原式$=\frac {5}{12}×\frac {1}{4}×8×36$

$=30$

A

D