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一、口算。
$3.14×20^{2}=$
$3.8+7.2=$
$\frac {5}{6}×\frac {8}{5}=$
$25.12÷3.14=$
$\frac {9}{2}÷\frac {12}{5}=$
$0.72÷0.9=$
$12.56÷3.14=$
$\frac {1}{4}+\frac {4}{5}=$
$39×\frac {5}{26}=$
$6.28÷3.14=$
$\frac {3}{5}×\frac {4}{21}=$
$6.5-5.6=$
$15.7÷3.14=$
$\frac {7}{3}-\frac {7}{10}=$
$40×5\% =$
$3.14×3^{2}=$
$1.57×0.2=$
$\frac {17}{5}+2=$
$28.26÷3.14=$
$\frac {60}{7}÷4=$
$1-\frac {4}{7}=$
$3.14×20^{2}=$
1256
$3.8+7.2=$
11
$\frac {5}{6}×\frac {8}{5}=$
$\frac{4}{3}$
$25.12÷3.14=$
8
$\frac {9}{2}÷\frac {12}{5}=$
$\frac{15}{8}$
$0.72÷0.9=$
0.8
$12.56÷3.14=$
4
$\frac {1}{4}+\frac {4}{5}=$
$\frac{21}{20}$
$39×\frac {5}{26}=$
$\frac{15}{2}$
$6.28÷3.14=$
2
$\frac {3}{5}×\frac {4}{21}=$
$\frac{4}{35}$
$6.5-5.6=$
0.9
$15.7÷3.14=$
5
$\frac {7}{3}-\frac {7}{10}=$
$\frac{49}{30}$
$40×5\% =$
2
$3.14×3^{2}=$
28.26
$1.57×0.2=$
0.314
$\frac {17}{5}+2=$
$\frac{27}{5}$
$28.26÷3.14=$
9
$\frac {60}{7}÷4=$
$\frac{15}{7}$
$1-\frac {4}{7}=$
$\frac{3}{7}$
答案
一、1256 11 $\frac{4}{3}$
8 $\frac{15}{8}$ 0.8
4 $\frac{21}{20}$ $\frac{15}{2}$
2 $\frac{4}{35}$ 0.9
5 $\frac{49}{30}$ 2
28.26 0.314 $\frac{27}{5}$
9 $\frac{15}{7}$ $\frac{3}{7}$
8 $\frac{15}{8}$ 0.8
4 $\frac{21}{20}$ $\frac{15}{2}$
2 $\frac{4}{35}$ 0.9
5 $\frac{49}{30}$ 2
28.26 0.314 $\frac{27}{5}$
9 $\frac{15}{7}$ $\frac{3}{7}$
二、计算圆柱的体积。
答案
二、$20×1.2=24(m^{3})$
$3.14×(28.26÷3.14÷2)^{2}×16=1017.36(m^{3})$
$3.14×(28.26÷3.14÷2)^{2}×16=1017.36(m^{3})$
