1. 直接写出得数。
$6 - 2.4 =$
$10 ÷ 0.5 =$
$56 + 28 =$
$7 ÷ 100 × 10 =$
$8 × 0.125 =$
$7 × 0.7 =$
$0.15 × 4 =$
$10 - 0.01 × 20 =$
$0.5 + 3.2 =$
$249 - 36 =$
$4 ÷ 0.5 =$
$7.8 + 6.9 - 1.1 =$
$1 ÷ 0.125 =$
$30 ÷ 0.6 =$
$0.45 ÷ 0.05 =$
$0.5 ÷ (0.25 × 2) =$
$\frac{17}{9} × 18 =$
$\frac{3}{8} × \frac{3}{10} =$
$\frac{4}{5} × 0.25 =$
$\frac{5}{6} - \frac{1}{3} + \frac{1}{6} =$
$\frac{9}{5} × \frac{2}{3} =$
$\frac{10}{39} × 0.13 =$
$\frac{1}{2} + \frac{7}{8} =$
$\frac{1}{2} ÷ \frac{2}{5} × 5 =$
$77 ÷ \frac{11}{10} =$
$\frac{3}{7} × \frac{4}{7} =$
$\frac{9}{7} × \frac{11}{12} =$
$\frac{7}{26} × 1.3 ÷ 7 =$
$\frac{12}{25} ÷ 0.4 =$
$48 ÷ \frac{3}{5} =$
$4.8 ÷ \frac{12}{5} =$
$0.13 ÷ (0.13 ÷ \frac{1}{5}) =$

1. 3.6 20 84 0.7
1 4.9 0.6 9.8
3.7 213 8 13.6
8 50 9 1
34 $\frac{9}{80}$ $\frac{1}{5}$ $\frac{2}{3}$
$\frac{6}{5}$ $\frac{1}{30}$ $\frac{11}{8}$ $\frac{25}{4}$
70 $\frac{12}{49}$ $\frac{33}{28}$ $\frac{1}{20}$
$\frac{6}{5}$ 80 2 $\frac{1}{5}$

2. 计算下面各题，怎样算简便就怎样算。
$5.4×0.56 + 0.56×4.6$ $62.8 - 15.2×0.4 - 2.8$ $24 ÷ [(1.68 - 0.72) × 0.25]$
$\frac{17}{18} + ( \frac{5}{6} - \frac{1}{4} ) ÷ \frac{7}{8}$ $\frac{10}{9} × 0.6 - \frac{1}{9} ÷ \frac{5}{3}$ $\frac{8}{9} ÷ [ \frac{3}{5} ÷ ( \frac{7}{10} - \frac{3}{5} ) ]$

2. 5.6 53.92 100
$\frac{29}{18}$ $\frac{3}{5}$ $\frac{4}{27}$

3. 填一填。
658×36
=(600+50+8)×( + )
=(600+50+8)×() + (600+50+8)×()
=() + () + () + () + () + ()
=()

3. 30 6 30 6
18000 1500 240 3600
300 48 23688