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一、口算。
$75÷30=$
$4.83+0.7=$
$20.5÷5=$
$\frac {3}{8}-25\% =$
$\frac {5}{9}×\frac {33}{40}=$
$\frac {7}{2}÷\frac {1}{2}=$
$\frac {3}{4}×50\% =$
$75÷30=$
2.5
$125×0.8=$100
$5.7÷10\% =$57
$4.83+0.7=$
5.53
$\frac {7}{11}×66=$42
$405+299=$704
$20.5÷5=$
4.1
$4.8-0.09=$4.71
$2÷\frac {5}{9}=$$\dfrac{18}{5}$
$\frac {3}{8}-25\% =$
$\dfrac{1}{8}$
$90×1.5=$135
$\frac {2}{15}+\frac {2}{9}=$$\dfrac{16}{45}$
$\frac {5}{9}×\frac {33}{40}=$
$\dfrac{11}{24}$
$\frac {7}{9}-\frac {1}{6}=$$\dfrac{11}{18}$
$1-0.41=$0.59
$\frac {7}{2}÷\frac {1}{2}=$
7
$\frac {3}{14}+\frac {2}{7}=$$\dfrac{1}{2}$
$2.3÷230\% =$1
$\frac {3}{4}×50\% =$
$\dfrac{3}{8}$
$65÷0.13=$500
$25\% ×25\% =$$\dfrac{1}{16}$
答案
一、2.5 100 57
5.53 42 704
4.1 4.71 $\dfrac{18}{5}$
$\dfrac{1}{8}$ 135 $\dfrac{16}{45}$
$\dfrac{11}{24}$ $\dfrac{11}{18}$ 0.59
7 $\dfrac{1}{2}$ 1
$\dfrac{3}{8}$ 500 $\dfrac{1}{16}$
5.53 42 704
4.1 4.71 $\dfrac{18}{5}$
$\dfrac{1}{8}$ 135 $\dfrac{16}{45}$
$\dfrac{11}{24}$ $\dfrac{11}{18}$ 0.59
7 $\dfrac{1}{2}$ 1
$\dfrac{3}{8}$ 500 $\dfrac{1}{16}$
二、计算圆锥的体积。
答案
二、$\dfrac{1}{3}× 3.14× {2.5}^{2}× 3.6=$
23.55($\mathrm{c}{\mathrm{m}}^{\mathrm{3}}$)
$\dfrac{1}{3}× 3.14× (28.26÷ 3.14÷$
$2)^{2}× 4.8=101.736(\mathrm{c}{\mathrm{m}}^{\mathrm{3}})$
23.55($\mathrm{c}{\mathrm{m}}^{\mathrm{3}}$)
$\dfrac{1}{3}× 3.14× (28.26÷ 3.14÷$
$2)^{2}× 4.8=101.736(\mathrm{c}{\mathrm{m}}^{\mathrm{3}})$
