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一、口算。
$1.6÷16=$
$3.5+7.6=$
$2.6×0.4=$
$2.42+80.58=$
$0.2×0.33=$
$4×0.85=$
$\frac {2}{7}+\frac {1}{2}=$
$\frac {3}{4}-\frac {1}{7}=$
$1.6÷16=$
0.1
$24×0.5=$12
$4.8÷1.6=$3
$3.5+7.6=$
11.1
$15÷0.03=$500
$6.2-3.8=$2.4
$2.6×0.4=$
1.04
$5.43+1.47=$6.9
$0.85×0.4=$0.34
$2.42+80.58=$
83
$4.2×0.5=$2.1
$0.84÷0.06=$14
$0.2×0.33=$
0.066
$8.1÷0.3=$27
$15÷0.6=$25
$4×0.85=$
3.4
$10.49-1.4=$9.09
$3.4+0.28=$3.68
$\frac {2}{7}+\frac {1}{2}=$
$\frac{11}{14}$
$\frac {4}{9}+\frac {1}{6}=$$\frac{11}{18}$
$\frac {7}{10}-\frac {2}{5}=$$\frac{3}{10}$
$\frac {3}{4}-\frac {1}{7}=$
$\frac{17}{28}$
$\frac {2}{3}+\frac {1}{5}=$$\frac{13}{15}$
$\frac {11}{21}-\frac {2}{7}=$$\frac{5}{21}$
答案
一、0.1 12 3
11.1 500 2.4
1.04 6.9 0.34
83 2.1 14
0.066 27 25
3.4 9.09 3.68
$\frac{11}{14}$ $\frac{11}{18}$ $\frac{3}{10}$
$\frac{17}{28}$ $\frac{13}{15}$ $\frac{5}{21}$
11.1 500 2.4
1.04 6.9 0.34
83 2.1 14
0.066 27 25
3.4 9.09 3.68
$\frac{11}{14}$ $\frac{11}{18}$ $\frac{3}{10}$
$\frac{17}{28}$ $\frac{13}{15}$ $\frac{5}{21}$
二、计算长方体和正方体的体积。(每个小正方体的体积表示$1cm^{3}$)
答案
二、$5×3×3=45(cm^{3})$
$4×4×4=64(cm^{3})$
$4×4×4=64(cm^{3})$
