《2025年王朝霞口算小达人六年级数学上册人教版》

1 直接写出得数。
$2.5×\frac {4}{5}= $
$\frac {6}{7}×\frac {21}{4}= $
$\frac {1}{2}×\frac {2}{3}= $
$\frac {5}{12}×\frac {16}{15}= $
$7×\frac {2}{15}= $
$\frac {2}{39}×\frac {13}{6}= $
$\frac {7}{54}×\frac {3}{14}= $
$15×\frac {12}{25}= $

答案： 1 2 $\frac{9}{2}$ $\frac{1}{3}$ $\frac{4}{9}$ $\frac{14}{15}$ $\frac{1}{9}$ $\frac{1}{36}$ $\frac{36}{5}$

2 计算下列各题,能简算的要简算。
$\frac {4}{5}×14×\frac {6}{7}$
$\frac {15}{16}×(\frac {3}{5}+\frac {1}{3})$
$(\frac {1}{5}-\frac {1}{7})×\frac {9}{2}$
$\frac {6}{7}×\frac {21}{5}×\frac {5}{72}$
$54×(\frac {5}{6}+\frac {2}{27}-\frac {5}{9})$
$\frac {4}{5}×\frac {15}{8}×\frac {16}{9}$

答案： 2 $\frac{48}{5}$ $\frac{7}{8}$ $\frac{9}{35}$ $\frac{1}{4}$ 19 $\frac{8}{3}$

3 计算下面两个图形的面积。
(1)

(2)

答案： 3
(1)$\frac{4}{5}×\frac{1}{2}×\frac{1}{2}=\frac{1}{5}$($m^{2}$)
(2)$(\frac{3}{4}+\frac{7}{8})×\frac{6}{13}×\frac{1}{2}=\frac{3}{8}$($m^{2}$)