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一、口算。
$0.4×0.2=$
$\frac {2}{5}+\frac {3}{8}=$
$\frac {11}{14}×\frac {3}{22}=$
$20\% ÷\frac {2}{9}=$
$72×\frac {3}{8}=$
$\frac {7}{10}÷\frac {4}{5}=$
$72÷0.4=$
$0.4×0.2=$
0.08
$9.09-90\% =$8.19
$\frac {7}{8}-(\frac {1}{4}+\frac {1}{8})=$$\frac{1}{2}$
$\frac {2}{5}+\frac {3}{8}=$
$\frac{31}{40}$
$\frac {9}{11}÷3=$$\frac{3}{11}$
$(3+\frac {3}{20})×5=$$\frac{63}{4}$
$\frac {11}{14}×\frac {3}{22}=$
$\frac{3}{28}$
$15\% +85\% =$1
$1÷\frac {2}{3}×\frac {3}{2}=$$\frac{9}{4}$
$20\% ÷\frac {2}{9}=$
0.9
$6÷10\% =$60
$\frac {3}{4}+\frac {1}{2}÷\frac {1}{2}=$$1\frac{3}{4}$
$72×\frac {3}{8}=$
27
$40×25\% =$10
$\frac {1}{3}×(15+\frac {6}{7})=$$5\frac{2}{7}$
$\frac {7}{10}÷\frac {4}{5}=$
$\frac{7}{8}$
$25\% -\frac {1}{5}=$$\frac{1}{20}$
$6÷(\frac {1}{2}-\frac {1}{3})=$36
$72÷0.4=$
180
$\frac {31}{40}×\frac {5}{62}=$$\frac{1}{16}$
$48×(\frac {1}{4}-\frac {1}{6})=$4
答案
一、$0.08$ $8.19$ $\frac{1}{2}$
$\frac{31}{40}$ $\frac{3}{11}$ $\frac{63}{4}$
$\frac{3}{28}$ $1$ $\frac{9}{4}$
$0.9$ $60$ $1\frac{3}{4}$
$27$ $10$ $5\frac{2}{7}$
$\frac{7}{8}$ $\frac{1}{20}$ $36$
$180$ $\frac{1}{16}$ $4$
$\frac{31}{40}$ $\frac{3}{11}$ $\frac{63}{4}$
$\frac{3}{28}$ $1$ $\frac{9}{4}$
$0.9$ $60$ $1\frac{3}{4}$
$27$ $10$ $5\frac{2}{7}$
$\frac{7}{8}$ $\frac{1}{20}$ $36$
$180$ $\frac{1}{16}$ $4$
二、计算下面各图形的表面积和体积。
答案
二、表面积：$(15×20 + 15×3 + 20×3)×2 + 6×6×4 = 954(cm^{2})$
体积：$15×20×3 + 6×6×6 = 1116(cm^{3})$
表面积：$(10×6 + 10×8 + 6×8)×2 = 376(m^{2})$
体积：$10×6×8 - 5×2×3 = 450(m^{3})$
体积：$15×20×3 + 6×6×6 = 1116(cm^{3})$
表面积：$(10×6 + 10×8 + 6×8)×2 = 376(m^{2})$
体积：$10×6×8 - 5×2×3 = 450(m^{3})$
