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一、口算。
$4.5 + 3.8 =$
$\frac{1}{7} - \frac{1}{12} =$
$\frac{12}{7} × \frac{7}{3} =$
$\frac{1}{4} - \frac{3}{16} =$
$1.7 ÷ 0.17 =$
$\frac{3}{8} + \frac{5}{12} =$
$28 ÷ \frac{7}{12} =$
$4.5 + 3.8 =$
8.3
$\frac{8}{15} ÷ \frac{3}{5} =$$\dfrac{8}{9}$
$\frac{4}{5} × \frac{5}{14} =$$\dfrac{2}{7}$
$\frac{1}{7} - \frac{1}{12} =$
$\dfrac{5}{84}$
$0.55 × 0.4 =$0.22
$72 ÷ 0.4 =$180
$\frac{12}{7} × \frac{7}{3} =$
4
$2.16 ÷ 0.3 =$7.2
$7.85 - 3.96 =$3.89
$\frac{1}{4} - \frac{3}{16} =$
$\dfrac{1}{16}$
$128 - 69 =$59
$16.9 ÷ 1.3 =$13
$1.7 ÷ 0.17 =$
10
$\frac{3}{7} + \frac{1}{28} =$$\dfrac{13}{28}$
$\frac{4}{5} × \frac{10}{7} =$$\dfrac{8}{7}$
$\frac{3}{8} + \frac{5}{12} =$
$\dfrac{19}{24}$
$7 - \frac{2}{5} =$$6\dfrac{3}{5}$
$\frac{11}{21} × \frac{3}{11} =$$\dfrac{1}{7}$
$28 ÷ \frac{7}{12} =$
48
$45\% × 20\% =$0.09
$8.32 - 6.76 =$1.56
答案
周五
一、8.3 $\dfrac{8}{9}$ $\dfrac{2}{7}$
$\dfrac{5}{84}$ 0.22 180
4 7.2 3.89
$\dfrac{1}{16}$ 59 13
10 $\dfrac{13}{28}$ $\dfrac{8}{7}$
$\dfrac{19}{24}$ $6\dfrac{3}{5}$ $\dfrac{1}{7}$
48 0.09 1.56
一、8.3 $\dfrac{8}{9}$ $\dfrac{2}{7}$
$\dfrac{5}{84}$ 0.22 180
4 7.2 3.89
$\dfrac{1}{16}$ 59 13
10 $\dfrac{13}{28}$ $\dfrac{8}{7}$
$\dfrac{19}{24}$ $6\dfrac{3}{5}$ $\dfrac{1}{7}$
48 0.09 1.56
二、用竖式计算。
$59 × 64$ $7.2 × 0.35$ $6.56 ÷ 1.4$
$\begin{array}{r}× \\\hline\end{array}$$ $$\begin{array}{r}× \\\hline\end{array}$$ $$\begin{array}{r}) \\\hline\end{array}$
（得数保留两位小数）
$5304 ÷ 78$ $10.01 - 9.05$ $1.84 × 0.45$
（得数保留两位小数）
$59 × 64$ $7.2 × 0.35$ $6.56 ÷ 1.4$
$\begin{array}{r}× \\\hline\end{array}$$ $$\begin{array}{r}× \\\hline\end{array}$$ $$\begin{array}{r}) \\\hline\end{array}$
（得数保留两位小数）
$5304 ÷ 78$ $10.01 - 9.05$ $1.84 × 0.45$
（得数保留两位小数）
答案
二、3776 2.52 4.69
68 0.96 0.83
68 0.96 0.83
