《2025年快乐口算六年级数学上册人教版》

$ \begin{array} { l } { 4 5 × ( 0. 6 + 0. 9 ) = } \\ { 7 6 + 1 2 × 1 1 = } \\ { 4 × 9 × 2 5 = } \\ { 7 0 × 8 ÷ 2 0 = } \\ { 2 0 0 - 1 1 × 1 1 = } \\ { \frac { 3 } { 5 } × 1 2 0 = } \\ { \frac { 1 } { 1 9 } × 9. 5 = } \\ { \frac { 4 } { 1 2 5 } × 1 0 0 0 = } \\ { \frac { 9 } { 1 6 } × 4 8 0 = } \\ { \frac { 3 } { 7 } × \frac { 7 } { 9 } × \frac { 6 } { 1 1 } = } \\ { 2 + \frac { 1 } { 3 } × \frac { 3 } { 5 } = } \\ { 5 × \frac { 7 } { 2 6 } × \frac { 1 3 } { 1 5 } = } \\ { \frac { 3 } { 1 4 } × \frac { 7 } { 9 } + 2 5 = } \end{array} $

答案： 1. $45×(0.6 + 0.9)$
= $45×1.5$
= $67.5$
2. $76 + 12×11$
= $76 + 132$
= $208$
3. $4×9×25$
= $4×25×9$
= $100×9$
= $900$
4. $70×8÷20$
= $560÷20$
= $28$
5. $200 - 11×11$
= $200 - 121$
= $79$
6. $\frac{3}{5}×120$
= $3×24$
= $72$
7. $\frac{1}{19}×9.5$
= $\frac{1}{19}×\frac{19}{2}$
= $\frac{1}{2}$
= $0.5$
8. $\frac{4}{125}×1000$
= $4×8$
= $32$
9. $\frac{9}{16}×480$
= $9×30$
= $270$
10. $\frac{3}{7}×\frac{7}{9}×\frac{6}{11}$
= $\frac{1}{3}×\frac{6}{11}$
= $\frac{2}{11}$
11. $2 + \frac{1}{3}×\frac{3}{5}$
= $2 + \frac{1}{5}$
= $2\frac{1}{5}$
12. $5×\frac{7}{26}×\frac{13}{15}$
= $5×\frac{7}{30}$
= $\frac{7}{6}$
13. $\frac{3}{14}×\frac{7}{9} + 25$
= $\frac{1}{6} + 25$
= $25\frac{1}{6}$

$ \begin{array} { l } { \frac { 5 } { 1 2 } × ( \frac { 1 } { 3 } + \frac { 1 } { 6 } ) = } \\ { \frac { 5 } { 7 } × 1 6 × \frac { 2 1 } { 5 } = } \\ { \frac { 9 } { 7 } × 1 4 × \frac { 2 1 } { 6 } = } \\ { \frac { 7 } { 4 } × \frac { 2 } { 3 } - \frac { 1 } { 2 } = } \\ { \frac { 1 1 } { 4 } × 1 1 - \frac { 1 } { 4 } = } \\ { \frac { 5 } { 6 } + \frac { 1 } { 8 } × \frac { 4 } { 3 3 } = } \\ { \frac { 4 } { 5 } × \frac { 7 } { 9 } × \frac { 5 } { 8 } = } \\ { \frac { 4 } { 7 } × \frac { 5 } { 8 } - \frac { 2 } { 2 1 } = } \\ { \frac { 7 } { 9 } + \frac { 1 } { 9 } × \frac { 3 } { 5 } = } \\ { \frac { 3 } { 5 } × \frac { 7 } { 9 } × \frac { 5 } { 1 4 } = } \\ { ( \frac { 3 } { 5 } - \frac { 1 } { 2 } ) × \frac { 5 } { 7 } = } \end{array} $

答案： 1.
$\frac{5}{12}×(\frac{1}{3}+\frac{1}{6})$
$=\frac{5}{12}×\frac{1}{2}$
$=\frac{5}{24}$
2.
$\frac{5}{7}×16×\frac{21}{5}$
$=\frac{5}{7}×\frac{21}{5}×16$
$=3×16$
$=48$
3.
$\frac{9}{7}×14×\frac{21}{6}$
$=18×\frac{21}{6}$
$=63$
4.
$\frac{7}{4}×\frac{2}{3}-\frac{1}{2}$
$=\frac{7}{6}-\frac{1}{2}$
$=\frac{7}{6}-\frac{3}{6}$
$=\frac{2}{3}$
5.
$\frac{11}{4}×11-\frac{1}{4}$
$=\frac{121}{4}-\frac{1}{4}$
$=\frac{120}{4}$
$=30$
6.
$\frac{5}{6}+\frac{1}{8}×\frac{4}{33}$
$=\frac{5}{6}+\frac{1}{66}$
$=\frac{55}{66}+\frac{1}{66}$
$=\frac{56}{66}$
$=\frac{28}{33}$
7.
$\frac{4}{5}×\frac{7}{9}×\frac{5}{8}$
$=\frac{4}{5}×\frac{5}{8}×\frac{7}{9}$
$=\frac{1}{2}×\frac{7}{9}$
$=\frac{7}{18}$
8.
$\frac{4}{7}×\frac{5}{8}-\frac{2}{21}$
$=\frac{5}{14}-\frac{2}{21}$
$=\frac{15}{42}-\frac{4}{42}$
$=\frac{11}{42}$
9.
$\frac{7}{9}+\frac{1}{9}×\frac{3}{5}$
$=\frac{7}{9}+\frac{1}{15}$
$=\frac{35}{45}+\frac{3}{45}$
$=\frac{38}{45}$
10.
$\frac{3}{5}×\frac{7}{9}×\frac{5}{14}$
$=\frac{3}{5}×\frac{5}{14}×\frac{7}{9}$
$=\frac{3}{14}×\frac{7}{9}$
$=\frac{1}{6}$
11.
$(\frac{3}{5}-\frac{1}{2})×\frac{5}{7}$
$=(\frac{6}{10}-\frac{5}{10})×\frac{5}{7}$
$=\frac{1}{10}×\frac{5}{7}$
$=\frac{1}{14}$