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一、口算。
$0.25×1.4=$
$3.2+2.88=$
$9.4-4.9=$
$1.8×0.4=$
$0.2×0.15=$
$9.6÷0.48=$
$\frac {2}{5}+\frac {3}{10}=$
$1-\frac {6}{13}=$
$0.25×1.4=$
0.35
$0.36÷3.6=$0.1
$4÷0.04=$100
$3.2+2.88=$
6.08
$0.45×0.5=$0.225
$8.02+2.16=$10.18
$9.4-4.9=$
4.5
$1.48+0.22=$1.7
$4.8÷0.6=$8
$1.8×0.4=$
0.72
$10÷0.5=$20
$10-9.99=$0.01
$0.2×0.15=$
0.03
$5.12+3.08=$8.2
$7.2+0.28=$7.48
$9.6÷0.48=$
20
$8.19÷0.9=$9.1
$0.9×0.04=$0.036
$\frac {2}{5}+\frac {3}{10}=$
$\frac{7}{10}$
$\frac {25}{36}-\frac {4}{9}=$$\frac{1}{4}$
$\frac {7}{8}+\frac {1}{3}=$$\frac{29}{24}$
$1-\frac {6}{13}=$
$\frac{7}{13}$
$\frac {2}{3}+\frac {1}{4}=$$\frac{11}{12}$
$\frac {3}{4}-\frac {2}{5}=$$\frac{7}{20}$
答案
一、0.35 0.1 100
6.08 0.225 10.18
4.5 1.7 8
0.72 20 0.01
0.03 8.2 7.48
20 9.1 0.036
$\frac{7}{10}$ $\frac{1}{4}$ $\frac{29}{24}$
$\frac{7}{13}$ $\frac{11}{12}$ $\frac{7}{20}$
6.08 0.225 10.18
4.5 1.7 8
0.72 20 0.01
0.03 8.2 7.48
20 9.1 0.036
$\frac{7}{10}$ $\frac{1}{4}$ $\frac{29}{24}$
$\frac{7}{13}$ $\frac{11}{12}$ $\frac{7}{20}$
二、计算长方体和正方体的体积。
答案
二、$15×4.8=72(cm^{3})$
$25×5=125(cm^{3})$
$25×5=125(cm^{3})$
