《2025年快乐口算六年级数学上册人教版》

1 算一算，比一比。
$ \frac{4}{5} × 2 = $$ $$ 1 ÷ \frac{2}{3} = $
$ \frac{6}{5} ÷ 2 = $$ $$ \frac{2}{3} ÷ 1 = $
$ \frac{10}{9} ÷ 2 = $$ $$ \frac{2}{15} ÷ 15 = $
$ \frac{10}{9} ÷ 5 = $$ $$ \frac{2}{15} × 15 = $
$ 10 ÷ \frac{10}{3} = $$ $$ 21 ÷ \frac{3}{7} = $
$ 10 ÷ \frac{3}{10} = $$ $$ \frac{3}{7} ÷ 21 = $
$ 20 ÷ \frac{4}{5} = $$ $$ \frac{6}{7} ÷ 6 = $
$ 20 ÷ \frac{5}{4} = $$ $$ \frac{6}{7} × 6 = $

答案： $\frac{4}{5}×2 = \frac{8}{5}$
$1÷\frac{2}{3} = 1×\frac{3}{2} = \frac{3}{2}$
$\frac{6}{5}÷2 = \frac{6}{5}×\frac{1}{2} = \frac{3}{5}$
$\frac{2}{3}÷1 = \frac{2}{3}$
$\frac{10}{9}÷2 = \frac{10}{9}×\frac{1}{2} = \frac{5}{9}$
$\frac{2}{15}÷15 = \frac{2}{15}×\frac{1}{15} = \frac{2}{225}$
$\frac{10}{9}÷5 = \frac{10}{9}×\frac{1}{5} = \frac{2}{9}$
$\frac{2}{15}×15 = 2$
$10÷\frac{10}{3} = 10×\frac{3}{10} = 3$
$21÷\frac{3}{7} = 21×\frac{7}{3} = 49$
$10÷\frac{3}{10} = 10×\frac{10}{3} = \frac{100}{3}$
$\frac{3}{7}÷21 = \frac{3}{7}×\frac{1}{21} = \frac{1}{49}$
$20÷\frac{4}{5} = 20×\frac{5}{4} = 25$
$\frac{6}{7}÷6 = \frac{6}{7}×\frac{1}{6} = \frac{1}{7}$
$20÷\frac{5}{4} = 20×\frac{4}{5} = 16$
$\frac{6}{7}×6 = \frac{36}{7}$

2 看图列式计算。
(1)书画兴趣班有12人

六(1)班有$x$人
(2)蝴蝶兰的种植面积为$210\mathrm{m}^2$

兰花的种植面积为$x\mathrm{m}^2$
(3)

1小时骑行$x\mathrm{km}$
已经骑行了$6\mathrm{km}$
小提示 读线段图时要弄清题意，找准单位“1”，写出等量关系式，用方程解决更容易。

答案：
(1)$\frac{2}{9}x=12$ $x=54$
(2)$\frac{3}{5}x$=210 $x=350$
(3)$\frac{2}{5}x=6$ $x=15$