《2025年快乐口算六年级数学上册人教版》

$\begin{array}{l}\dfrac{7}{12} × 5 = \\\dfrac{5}{6} × 42 = \\\dfrac{3}{7} × 28 = \\33 × \dfrac{2}{11} = \\15 × \dfrac{4}{25} = \\5 × \dfrac{2}{5} = \\\dfrac{5}{6} × 10 = \\\dfrac{2}{13} × 26 = \\\dfrac{3}{100} × 1000 = \\6 × \dfrac{1}{2} = \\4 × \dfrac{9}{56} =\end{array}$

答案： 1.
$\dfrac{7}{12} × 5$
$=\dfrac{7×5}{12}$
$=\dfrac{35}{12}$
$= 2\dfrac{11}{12}$
2.
$\dfrac{5}{6} × 42$
$=\dfrac{5×42}{6}$
$ = 35$
3.
$\dfrac{3}{7} × 28$
$=\dfrac{3×28}{7}$
$ = 12$
4.
$33 × \dfrac{2}{11}$
$=\dfrac{33×2}{11}$
$ = 6$
5.
$15 × \dfrac{4}{25}$
$=\dfrac{15×4}{25}$
$=\dfrac{60}{25}$
$=\dfrac{12}{5}$
$= 2\dfrac{2}{5}$
6.
$5 × \dfrac{2}{5}$
$=\dfrac{5×2}{5}$
$ = 2$
7.
$\dfrac{5}{6} × 10$
$=\dfrac{5×10}{6}$
$=\dfrac{50}{6}$
$=\dfrac{25}{3}$
$= 8\dfrac{1}{3}$
8.
$\dfrac{2}{13} × 26$
$=\dfrac{2×26}{13}$
$ = 4$
9.
$\dfrac{3}{100} × 1000$
$=\dfrac{3×1000}{100}$
$ = 30$
10.
$6 × \dfrac{1}{2}$
$=\dfrac{6×1}{2}$
$ = 3$
11.
$4 × \dfrac{9}{56}$
$=\dfrac{4×9}{56}$
$=\dfrac{36}{56}$
$=\dfrac{9}{14}$

$\begin{array}{l}\dfrac{6}{5} × \dfrac{1}{6} = \\\dfrac{2}{3} × \dfrac{9}{8} = \\\dfrac{3}{10} × \dfrac{1}{5} = \\\dfrac{7}{8} × \dfrac{3}{14} = \\\dfrac{5}{9} × \dfrac{2}{5} = \\1 × \dfrac{2}{9} = \\\dfrac{1}{2} × \dfrac{1}{3} = \\\dfrac{1}{2} × \dfrac{6}{7} = \\\dfrac{8}{5} × \dfrac{1}{2} = \\\dfrac{39}{50} × \dfrac{1}{26} = \\\dfrac{2}{5} + 2 =\end{array}$

答案： 1.
$\frac{6}{5} × \frac{1}{6} = \frac{6 × 1}{5 × 6} = \frac{1}{5}$
2.
$\frac{2}{3} × \frac{9}{8} = \frac{2 × 9}{3 × 8} = \frac{18}{24} = \frac{3}{4}$
3.
$\frac{3}{10} × \frac{1}{5} = \frac{3 × 1}{10 × 5} = \frac{3}{50}$
4.
$\frac{7}{8} × \frac{3}{14} = \frac{7 × 3}{8 × 14} = \frac{21}{112} = \frac{3}{16}$
5.
$\frac{5}{9} × \frac{2}{5} = \frac{5 × 2}{9 × 5} = \frac{10}{45} = \frac{2}{9}$
6.
$1 × \frac{2}{9} = \frac{1 × 2}{1 × 9} = \frac{2}{9}$
7.
$\frac{1}{2} × \frac{1}{3} = \frac{1 × 1}{2 × 3} = \frac{1}{6}$
8.
$\frac{1}{2} × \frac{6}{7} = \frac{1 × 6}{2 × 7} = \frac{6}{14} = \frac{3}{7}$
9.
$\frac{8}{5} × \frac{1}{2} = \frac{8 × 1}{5 × 2} = \frac{8}{10} = \frac{4}{5}$
10.
$\frac{39}{50} × \frac{1}{26} = \frac{39 × 1}{50 × 26} = \frac{39}{1300} = \frac{3}{100}$
11.
$\frac{2}{5} + 2 = \frac{2}{5} + \frac{10}{5} = \frac{12}{5} = 2\frac{2}{5}$

$\begin{array}{l}\dfrac{13}{11} × \dfrac{11}{26} = \\\dfrac{4}{15} × \dfrac{5}{12} = \\\dfrac{5}{2} × \dfrac{2}{11} = \\6 × \dfrac{1}{6} = \\\dfrac{2}{11} × \dfrac{5}{6} = \\\dfrac{5}{32} × \dfrac{8}{25} = \\\dfrac{9}{14} × \dfrac{7}{18} = \\\dfrac{8}{11} × \dfrac{1}{4} = \\\dfrac{3}{7} × \dfrac{3}{7} = \\\dfrac{3}{5} × 25 = \\\dfrac{2}{35} × \dfrac{21}{22} =\end{array}$

答案： $\dfrac{13}{11} × \dfrac{11}{26} = \dfrac{13×11}{11×26} = \dfrac{1}{2}$
$\dfrac{4}{15} × \dfrac{5}{12} = \dfrac{4×5}{15×12} = \dfrac{1}{9}$
$\dfrac{5}{2} × \dfrac{2}{11} = \dfrac{5×2}{2×11} = \dfrac{5}{11}$
$6 × \dfrac{1}{6} = \dfrac{6×1}{6} = 1$
$\dfrac{2}{11} × \dfrac{5}{6} = \dfrac{2×5}{11×6} = \dfrac{5}{33}$
$\dfrac{5}{32} × \dfrac{8}{25} = \dfrac{5×8}{32×25} = \dfrac{1}{20}$
$\dfrac{9}{14} × \dfrac{7}{18} = \dfrac{9×7}{14×18} = \dfrac{1}{4}$
$\dfrac{8}{11} × \dfrac{1}{4} = \dfrac{8×1}{11×4} = \dfrac{2}{11}$
$\dfrac{3}{7} × \dfrac{3}{7} = \dfrac{3×3}{7×7} = \dfrac{9}{49}$
$\dfrac{3}{5} × 25 = \dfrac{3×25}{5} = 15$
$\dfrac{2}{35} × \dfrac{21}{22} = \dfrac{2×21}{35×22} = \dfrac{3}{55}$

小知识 分数乘分数，用( )相乘的积作( )，用( )相乘的积作( )。能约分的可以先约分，再计算。

答案： 分子，分子，分母，分母