第19页 - 启东中学作业本七年级数学人教版

$=-16+2×9-6×\frac {3}{4}$

$=-16+18-\frac {9}{2}$

$=-\frac {5}{2}$

$=[9+\frac {3}{4}×\frac {8}{3}-19]×(-4)$

$=[9+2-19]×(-4)$

$=(-8)×(-4)$

$=32$

$=-1+6-9$

$=-4$

$=1÷2+(-\frac {1}{8})×16$

$=\frac {1}{2}+(-2)$

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

$=[\frac {5}{4}-\frac {3}{8}×24-\frac {1}{6}×24+\frac {3}{4}×24]÷5$

$=[\frac {5}{4}-9-4+18]×\frac {1}{5}$

$=\frac {25}{4}×\frac {1}{5}$

$=\frac {5}{4}$

$=-3-[\frac {3}{2}-\frac {1}{2}]^3$

$=-3-1$

$=-4$

$=[1-(1-\frac {1}{6})]×[2-9]$

$=\frac {1}{6}×(-7)$

$=-\frac {7}{6}$

$=16÷(-8)÷\frac {25}{2}×(-4)-1$

$=16×\frac {1}{8}×\frac {2}{25}×4-1$

$=\frac {16}{25}-1$

$=-\frac {9}{25}$