2025年通城学典初中数学运算能手七年级上册苏科版第23页答案
1. $(-49)÷7= $

答案

-7
2. $(+4)÷(-\frac {1}{8})= $

答案

-32

解析

$(+4)÷(-\frac{1}{8}) = 4×(-8) = -32$
3. $(-27)÷(-9)= $

答案

3
4. $(-1.6)÷(-0.4)= $

答案

4

解析

$(-1.6)÷(-0.4)=1.6÷0.4=4$
5. $(-2)÷(+\frac {1}{2})= $

答案

-4

解析

$(-2) ÷ \left(+\frac{1}{2}\right) = (-2) × 2 = -4$
6. $0÷(-817)= $

答案

0
7. $( )÷(+5\frac {1}{2})= -1$

答案

$-5\frac{1}{2}$
8. $(-12\frac {2}{3})÷( )= -1$

答案

$12\frac{2}{3}$
9. $(-27)÷(+\frac {3}{2})$

答案

-18

解析

$(-27)÷(+\frac{3}{2}) = -27×\frac{2}{3} = -18$
10. $(-8\frac {8}{9})÷(-8)$

答案

$1\frac{1}{9}$

解析

$(-8\frac{8}{9})÷(-8)$
$=(-\frac{80}{9})×(-\frac{1}{8})$
$=\frac{80}{9}×\frac{1}{8}$
$=\frac{10}{9}$
$=1\frac{1}{9}$
11. $8÷(-1\frac {4}{5})×0$

答案

0

解析

$8÷\left(-1\frac{4}{5}\right)×0 = 0$
12. $(+6\frac {2}{3})÷(-1\frac {2}{3})$

答案

-4

解析

$(+6\frac{2}{3})÷(-1\frac{2}{3})$
$=\frac{20}{3}÷(-\frac{5}{3})$
$=\frac{20}{3}×(-\frac{3}{5})$
$=-4$
13. $(-0.25)÷(+\frac {2}{3})×(-\frac {8}{5})$

答案

$\frac{3}{5}$

解析

$(-0.25)÷(+\frac{2}{3})×(-\frac{8}{5})$
$=(-\frac{1}{4})×\frac{3}{2}×(-\frac{8}{5})$
$=(-\frac{3}{8})×(-\frac{8}{5})$
$=\frac{3}{5}$
14. $(-1\frac {2}{5})÷(-15)÷(-\frac {7}{3})$

答案

$-\frac{1}{25}$

解析

$(-1\frac{2}{5})÷(-15)÷(-\frac{7}{3})$
$=(-\frac{7}{5})×(-\frac{1}{15})×(-\frac{3}{7})$
$=-\frac{7}{5}×\frac{1}{15}×\frac{3}{7}$
$=-\frac{1}{25}$
15. $[(+\frac {1}{6})-(-\frac {1}{18})]÷(-\frac {1}{54})$

答案

-12

解析

$\begin{aligned}\left[(+\frac{1}{6}) - (-\frac{1}{18})\right] ÷ (-\frac{1}{54})&=\left(\frac{1}{6} + \frac{1}{18}\right) × (-54)\\&=\left(\frac{3}{18} + \frac{1}{18}\right) × (-54)\\&=\frac{4}{18} × (-54)\\&=\frac{2}{9} × (-54)\\&=-12\end{aligned}$
16. $(-5)÷\frac {3}{7}×|-\frac {4}{7}|÷(-\frac {20}{3})$

答案

1

解析

$(-5)÷\frac{3}{7}×|-\frac{4}{7}|÷(-\frac{20}{3})$
$=(-5)×\frac{7}{3}×\frac{4}{7}×(-\frac{3}{20})$
$=(-5)×\frac{4}{3}×(-\frac{3}{20})$
$=(-\frac{20}{3})×(-\frac{3}{20})$
$=1$