$\frac{5}{8}-\frac{1}{4}=$ 0.72×0.5= $\frac{5}{18}\div\frac{7}{8}=$
4.8÷1.6= $\frac{3}{7}+\frac{1}{4}=$ $\frac{4}{5}-\frac{2}{13}=$
625×$\frac{1}{25}=$ 5.1 - 2.7= 32÷0.04=
10.5 + 1.5= 0.65÷0.13= 1 - 1%=
2.25×4= 2 - 0.25= $\frac{5}{12}\times\frac{5}{6}=$
2÷0.05= $\frac{3}{8}\times\frac{4}{9}=$ 256÷0.8=
0.75×90= 0.85 + 0.47= 607 - 308=
$\frac{13}{15}-\frac{2}{5}=$ $\frac{3}{5}\div10\%=$ $\frac{5}{16}\times\frac{3}{5}=$
$\frac{9}{4}\div\frac{3}{2}=$ $\frac{4}{5}+\frac{1}{10}=$ 2.6÷0.8=
35%×10%= 4.28 + 3.2= 75%÷$\frac{4}{3}=$

$\frac{3}{8}$ 0.36 $\frac{20}{63}$
3 $\frac{19}{28}$ $\frac{42}{65}$
25 2.4 800
12 5 0.99
9 1.75 $\frac{25}{72}$
40 $\frac{1}{6}$ 320
67.5 1.32 299
$\frac{7}{15}$ 6 $\frac{3}{16}$
$\frac{3}{2}$ $\frac{9}{10}$ 3.25
0.035 7.48 $\frac{9}{16}$

486 + 625 15.36 - 12.9 4.86×2.54（得数保留两位小数）

1111 2.46 12.34