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一、口算。
$60×0.65=$
$1.48 - 0.8=$
$16 - 4.5 - 5.5=$
$0.75×0.4=$
$30.4÷4=$
$2.5 - 3.6÷1.8=$
$2.6÷1.3=$
$3.8 + 0.18=$
$4×1.2×0.25=$
$0.75×0.6=$
$1.8÷0.3=$
$6.72 - (0.38 + 1.72)=$
$0.72÷0.6=$
$8.2 + 1.8=$
$0.8 - 0.8÷2=$
$5.3 - 5.03=$
$3.1 - 2.9=$
$1.9 + 5.1÷51=$
$1 + \frac{2}{3}=$
$\frac{1}{2} - \frac{2}{5}=$
$\frac{7}{11} - \frac{1}{5} + \frac{4}{11}=$
$\frac{3}{4} - \frac{7}{24}=$
$\frac{1}{6} + \frac{2}{5}=$
$\frac{7}{5} - \frac{2}{3} - \frac{1}{3}=$
$60×0.65=$
39
$1.48 - 0.8=$
0.68
$16 - 4.5 - 5.5=$
6
$0.75×0.4=$
0.3
$30.4÷4=$
7.6
$2.5 - 3.6÷1.8=$
0.5
$2.6÷1.3=$
2
$3.8 + 0.18=$
3.98
$4×1.2×0.25=$
1.2
$0.75×0.6=$
0.45
$1.8÷0.3=$
6
$6.72 - (0.38 + 1.72)=$
4.62
$0.72÷0.6=$
1.2
$8.2 + 1.8=$
10
$0.8 - 0.8÷2=$
0.4
$5.3 - 5.03=$
0.27
$3.1 - 2.9=$
0.2
$1.9 + 5.1÷51=$
2
$1 + \frac{2}{3}=$
$1\frac{2}{3}$
$\frac{1}{2} - \frac{2}{5}=$
$\frac{1}{10}$
$\frac{7}{11} - \frac{1}{5} + \frac{4}{11}=$
$\frac{4}{5}$
$\frac{3}{4} - \frac{7}{24}=$
$\frac{11}{24}$
$\frac{1}{6} + \frac{2}{5}=$
$\frac{17}{30}$
$\frac{7}{5} - \frac{2}{3} - \frac{1}{3}=$
$\frac{2}{5}$
答案
一、39 0.68 6
0.3 7.6 0.5
2 3.98 1.2
0.45 6 4.62
1.2 10 0.4
0.27 0.2 2
$1\frac{2}{3}$ $\frac{1}{10}$ $\frac{4}{5}$
$\frac{11}{24}$ $\frac{17}{30}$ $\frac{2}{5}$
0.3 7.6 0.5
2 3.98 1.2
0.45 6 4.62
1.2 10 0.4
0.27 0.2 2
$1\frac{2}{3}$ $\frac{1}{10}$ $\frac{4}{5}$
$\frac{11}{24}$ $\frac{17}{30}$ $\frac{2}{5}$
二、计算下面各图形的体积。
答案
二、$5×5×1 + 3×3×3 = 52(cm^{3})$
$25×15×20 - (25 - 15)×15×(20 - 10) = 6000(cm^{3})$
$25×15×20 - (25 - 15)×15×(20 - 10) = 6000(cm^{3})$
