第32页 - 亮点给力提优课时作业本七年级数学江苏版

C

B

4

＞

＜

＞

＜

＞

＜

$-1或1$

$ \begin{aligned}解：原式&=+(\frac{1}{12}×36×\frac{7}{9}×3) \\ &=7 \\ \end{aligned}$

$ \begin{aligned}解：原式&=-(\frac{1}{2}×\frac{2}{3}×\frac{3}{4}×\frac{9}{8}) \\ &=－\frac{9}{32} \\ \end{aligned}$

$ \begin{aligned}解：原式&=-(\frac{3}{7}×\frac{1}{8}×\frac{8}{3}×8) \\ &=－\frac{8}{7} \\ \end{aligned}$

$ \begin{aligned}解：原式&=\frac{1}{2}×(－\frac{2}{3})×\frac{3}{4}×...×(－\frac{2022}{2023})× \frac{2023}{2024} \\ &=－\frac{1}{2} × \frac{2}{3} × \frac{3}{4} × .. × \frac{2022}{2023} ×\frac{2023}{2024}) \\ &=-\frac{1}{2024} \\ \end{aligned}$