《2025年心算口算巧算六年级上册北师大版》

1 求下面各比的比值。
$\frac{1}{20}:\frac{1}{5}=$
0.6:$\frac{2}{3}=$
$\frac{8}{9}:\frac{14}{15}=$
$\frac{1}{20}:\frac{1}{4}=$
1.6:2.4=
$\frac{25}{24}:\frac{5}{6}=$
$\frac{3}{5}:0.8=$
0.32:0.8=
$\frac{3}{7}:\frac{5}{21}=$
0.375:$\frac{3}{4}=$
$\frac{4}{9}:\frac{4}{15}=$
$\frac{1}{6}:\frac{2}{7}=$
$\frac{3}{8}:\frac{4}{9}=$
5.6:0.7=
0.4:$\frac{5}{8}=$
20%:$\frac{4}{5}=$
25%:$\frac{1}{16}=$
$\frac{3}{7}:\frac{9}{10}=$

答案： $\frac{1}{4}$
$\frac{9}{10}$
$\frac{20}{21}$
$\frac{1}{5}$
$\frac{2}{3}$
$\frac{5}{4}$
$\frac{3}{4}$
$\frac{2}{5}$
$\frac{9}{5}$
$\frac{1}{2}$
$\frac{5}{3}$
$\frac{7}{12}$
$\frac{27}{32}$
8
$\frac{16}{25}$
$\frac{1}{4}$
4
$\frac{10}{21}$

2 计算下面各题。(能简算的要简算)
$\frac{2}{3}÷8+\frac{1}{3}×\frac{1}{8}$
$24×(\frac{1}{3}+\frac{1}{4}-\frac{1}{12})$
$\frac{3}{8}×79+\frac{3}{8}$
$\frac{3}{7}×\frac{3}{2}+\frac{4}{7}×\frac{3}{2}$
$\frac{4}{5}×99+\frac{4}{5}$
$\frac{21}{25}×\frac{3}{7}+\frac{4}{25}÷\frac{7}{3}$
$\frac{3}{7}×\frac{1}{3}+\frac{5}{7}×\frac{8}{5}$
$\frac{4}{9}÷\frac{4}{15}×\frac{5}{3}$
$\frac{1}{6}×\frac{2}{7}÷(\frac{2}{7}+1)$

答案： $\frac{1}{8}$
12
30
$\frac{3}{2}$
80
$\frac{3}{7}$
$\frac{9}{7}$
$\frac{25}{9}$
$\frac{1}{27}$