《2025年快乐口算六年级数学上册人教版》

$ \frac{1}{3} + \frac{1}{4} = $
$ \frac{1}{3} - \frac{1}{4} = $
$ \frac{1}{7} × 1.4 = $
$ 2.4 × \frac{1}{4} = $
$ \frac{2}{3} × 27 = $
$ 16 × \frac{5}{32} = $
$ \frac{2}{5} × \frac{1}{6} = $
$ \frac{1}{4} × \frac{1}{4} = $
$ \frac{1}{5} × \frac{1}{5} = $
$ 5 × \frac{11}{15} = $
$ \frac{11}{12} × \frac{36}{121} = $

答案： $\frac{1}{3} + \frac{1}{4} = \frac{4}{12} + \frac{3}{12} = \frac{7}{12}$
$\frac{1}{3} - \frac{1}{4} = \frac{4}{12} - \frac{3}{12} = \frac{1}{12}$
$\frac{1}{7} × 1.4 = \frac{1}{7} × \frac{7}{5} = \frac{1}{5} = 0.2$
$2.4 × \frac{1}{4} = \frac{12}{5} × \frac{1}{4} = \frac{3}{5} = 0.6$
$\frac{2}{3} × 27 = 2×9 = 18$
$16 × \frac{5}{32} = \frac{5}{2} = 2.5$
$\frac{2}{5} × \frac{1}{6} = \frac{2×1}{5×6} = \frac{1}{15}$
$\frac{1}{4} × \frac{1}{4} = \frac{1×1}{4×4} = \frac{1}{16}$
$\frac{1}{5} × \frac{1}{5} = \frac{1×1}{5×5} = \frac{1}{25}$
$5 × \frac{11}{15} = \frac{11}{3}$
$\frac{11}{12} × \frac{36}{121} = \frac{11×36}{12×121} = \frac{3}{11}$

$  2.5 × \frac{4}{5} = \frac{4}{7} × \frac{5}{8} = \frac{5}{6} × 0.3 = 0.75 × \frac{1}{6} = \frac{12}{7} × \frac{10}{9} = 5 × \frac{1}{8} = \frac{4}{15} × \frac{1}{7} = 2.2 × \frac{1}{2} = \frac{7}{8} × \frac{15}{14} = 0.8 × \frac{3}{4} = \frac{2}{3} × 9 = $

答案： 2.5×$\frac{4}{5}$
= $\frac{5}{2}$×$\frac{4}{5}$
= 2
$\frac{4}{7}$×$\frac{5}{8}$
= $\frac{4×5}{7×8}$
= $\frac{20}{56}$
= $\frac{5}{14}$
$\frac{5}{6}$×0.3
= $\frac{5}{6}$×$\frac{3}{10}$
= $\frac{15}{60}$
= $\frac{1}{4}$
0.75×$\frac{1}{6}$
= $\frac{3}{4}$×$\frac{1}{6}$
= $\frac{3}{24}$
= $\frac{1}{8}$
$\frac{12}{7}$×$\frac{10}{9}$
= $\frac{12×10}{7×9}$
= $\frac{120}{63}$
= $\frac{40}{21}$
5×$\frac{1}{8}$
= $\frac{5}{8}$
$\frac{4}{15}$×$\frac{1}{7}$
= $\frac{4×1}{15×7}$
= $\frac{4}{105}$
2.2×$\frac{1}{2}$
= $\frac{11}{5}$×$\frac{1}{2}$
= $\frac{11}{10}$
= 1.1
$\frac{7}{8}$×$\frac{15}{14}$
= $\frac{7×15}{8×14}$
= $\frac{105}{112}$
= $\frac{15}{16}$
0.8×$\frac{3}{4}$
= $\frac{4}{5}$×$\frac{3}{4}$
= $\frac{12}{20}$
= $\frac{3}{5}$
$\frac{2}{3}$×9
= $\frac{2×9}{3}$
= 6