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一、口算。
$\dfrac{12}{25}× \dfrac{5}{6}=$
$0.7÷ 0.8=$
$8.8-2.8=$
$\dfrac{10}{21}÷ \dfrac{5}{6}=$
$0.5^{2}-0.3^{2}=$
$2.4÷ 24\%=$
$\dfrac{8}{15}÷ \dfrac{4}{5}=$
$\dfrac{12}{25}× \dfrac{5}{6}=$
$\frac{2}{5}$
$\dfrac{1}{3}-\dfrac{2}{9}=$$\frac{1}{9}$
$8.4÷ 70=$0.12
$0.7÷ 0.8=$
$\frac{7}{8}$
$\dfrac{3}{8}× \dfrac{2}{3}=$$\frac{1}{4}$
$\dfrac{7}{15}-\dfrac{2}{35}=$$\frac{43}{105}$
$8.8-2.8=$
6
$3.6÷ \dfrac{9}{10}=$4
$2.198÷ 3.14=$0.7
$\dfrac{10}{21}÷ \dfrac{5}{6}=$
$\frac{4}{7}$
$65\%+45\%=$110%
$128× \dfrac{3}{8}=$48
$0.5^{2}-0.3^{2}=$
0.16
$3.14× 200=$628
$\dfrac{3}{7}+\dfrac{5}{8}=$$\frac{59}{56}$
$2.4÷ 24\%=$
10
$3.6+4.04=$7.64
$62.5\%× \dfrac{4}{5}=$$\frac{1}{2}$
$\dfrac{8}{15}÷ \dfrac{4}{5}=$
$\frac{2}{3}$
$4.75× 0.2=$0.95
$\dfrac{7}{18}+\dfrac{5}{12}=$$\frac{29}{36}$
答案
一、$\frac{2}{5}$ $\frac{1}{9}$ 0.12
$\frac{7}{8}$ $\frac{1}{4}$ $\frac{43}{105}$
6 4 0.7
$\frac{4}{7}$ 110% 48
0.16 628 $\frac{59}{56}$
10 7.64 $\frac{1}{2}$
$\frac{2}{3}$ 0.95 $\frac{29}{36}$
$\frac{7}{8}$ $\frac{1}{4}$ $\frac{43}{105}$
6 4 0.7
$\frac{4}{7}$ 110% 48
0.16 628 $\frac{59}{56}$
10 7.64 $\frac{1}{2}$
$\frac{2}{3}$ 0.95 $\frac{29}{36}$
二、用竖式计算。
$209+896$ $0.702× 15$ $1260÷ 35$
$\begin{array}{r} \\ + \end{array}$ $\begin{array}{r} \\ × \end{array}$ $\begin{array}{r} \\ ) \end{array}$
$654-87.6$ $38× 213$ $9.6÷ 0.39$
（得数保留两位小数）
$209+896$ $0.702× 15$ $1260÷ 35$
$\begin{array}{r} \\ + \end{array}$ $\begin{array}{r} \\ × \end{array}$ $\begin{array}{r} \\ ) \end{array}$
$654-87.6$ $38× 213$ $9.6÷ 0.39$
（得数保留两位小数）
答案
二、1105 10.53 36
566.4 8094 24.62
566.4 8094 24.62
