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一、口算。
$4.8÷1.6=$
$\frac {3}{7}+\frac {1}{4}=$
$\frac {4}{5}-\frac {2}{13}=$
$625×\frac {1}{25}=$
$5.1-2.7=$
$32÷0.04=$
$2.25×4=$
$2-0.25=$
$1-1\% =$
$0.75×90=$
$0.85+0.47=$
$607-308=$
$\frac {13}{15}-\frac {2}{5}=$
$\frac {3}{5}÷10\% =$
$\frac {5}{16}×\frac {3}{5}=$
$\frac {9}{4}÷\frac {3}{2}=$
$\frac {4}{5}+\frac {1}{10}=$
$2.6÷0.8=$
$35\% ×10\% =$
$4.28+3.2=$
$75\% ÷\frac {4}{3}=$
$4.8÷1.6=$
3
$\frac {3}{7}+\frac {1}{4}=$
$\dfrac{19}{28}$
$\frac {4}{5}-\frac {2}{13}=$
$\dfrac{42}{65}$
$625×\frac {1}{25}=$
25
$5.1-2.7=$
2.4
$32÷0.04=$
800
$2.25×4=$
9
$2-0.25=$
1.75
$1-1\% =$
0.99
$0.75×90=$
67.5
$0.85+0.47=$
1.32
$607-308=$
299
$\frac {13}{15}-\frac {2}{5}=$
$\dfrac{7}{15}$
$\frac {3}{5}÷10\% =$
6
$\frac {5}{16}×\frac {3}{5}=$
$\dfrac{3}{16}$
$\frac {9}{4}÷\frac {3}{2}=$
$\dfrac{3}{2}$
$\frac {4}{5}+\frac {1}{10}=$
$\dfrac{9}{10}$
$2.6÷0.8=$
3.25
$35\% ×10\% =$
0.035
$4.28+3.2=$
7.48
$75\% ÷\frac {4}{3}=$
$\dfrac{9}{16}$
答案
3 $\dfrac{19}{28}$ $\dfrac{42}{65}$
25 2.4 800
9 1.75 0.99
67.5 1.32 299
$\dfrac{7}{15}$ 6 $\dfrac{3}{16}$
$\dfrac{3}{2}$ $\dfrac{9}{10}$ 3.25
0.035 7.48 $\dfrac{9}{16}$
25 2.4 800
9 1.75 0.99
67.5 1.32 299
$\dfrac{7}{15}$ 6 $\dfrac{3}{16}$
$\dfrac{3}{2}$ $\dfrac{9}{10}$ 3.25
0.035 7.48 $\dfrac{9}{16}$
二、用竖式计算。
$486+625$
$15.36-12.9$
$4.86×2.54$
（得数保留两位小数）
$985-776$
$25.03+7.78$
$98÷5.7$
（得数保留两位小数）
$486+625$
$15.36-12.9$
$4.86×2.54$
（得数保留两位小数）
$985-776$
$25.03+7.78$
$98÷5.7$
（得数保留两位小数）
答案
1111 2.46 12.34
209 32.81 17.19
209 32.81 17.19
