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一、口算。
$55\% ×0.2=$
$0.25×40=$
$0.18÷90\% =$
$8.1÷0.03=$
$\frac {9}{8}-\frac {1}{3}=$
$\frac {7}{4}×\frac {5}{7}=$
$\frac {48}{49}÷\frac {6}{7}=$
$55\% ×0.2=$
0.11
$1.5×0.5=$0.75
$3.9÷13\% =$30
$0.25×40=$
10
$1.1-0.74=$0.36
$\frac {5}{9}×\frac {3}{2}=$$\frac{5}{6}$
$0.18÷90\% =$
0.2
$\frac {5}{8}+\frac {7}{5}=$$\frac{81}{40}$
$\frac {3}{5}÷\frac {3}{4}=$$\frac{4}{5}$
$8.1÷0.03=$
270
$\frac {1}{3}×\frac {3}{4}=$$\frac{1}{4}$
$4.57+6.43=$11
$\frac {9}{8}-\frac {1}{3}=$
$\frac{19}{24}$
$125\% ×4=$5
$\frac {5}{6}÷75\% =$$\frac{10}{9}$
$\frac {7}{4}×\frac {5}{7}=$
$\frac{5}{4}$
$3÷3\% =$100
$26.26÷26=$1.01
$\frac {48}{49}÷\frac {6}{7}=$
$\frac{8}{7}$
$\frac {2}{5}-\frac {1}{15}=$$\frac{1}{3}$
$\frac {28}{25}×\frac {5}{7}=$$\frac{4}{5}$
答案
一、$0.11$ $0.75$ $30$
$10$ $0.36$ $\frac{5}{6}$
$0.2$ $\frac{81}{40}$ $\frac{4}{5}$
$270$ $\frac{1}{4}$ $11$
$\frac{19}{24}$ $5$ $\frac{10}{9}$
$\frac{5}{4}$ $100$ $1.01$
$\frac{8}{7}$ $\frac{1}{3}$ $\frac{4}{5}$
$10$ $0.36$ $\frac{5}{6}$
$0.2$ $\frac{81}{40}$ $\frac{4}{5}$
$270$ $\frac{1}{4}$ $11$
$\frac{19}{24}$ $5$ $\frac{10}{9}$
$\frac{5}{4}$ $100$ $1.01$
$\frac{8}{7}$ $\frac{1}{3}$ $\frac{4}{5}$
二、计算下面各图形的表面积和体积。
答案
二、表面积：$(10×8 + 10×5 + 8×5)×2 + 2×2×4 = 356(cm^{2})$
体积：$10×8×5 - 2×2×2 = 392(cm^{3})$
表面积：$3×4 + 4×4 + 3×4÷2×2 + 4×5 = 60(m^{2})$
体积：$4×4×3÷2 = 24(m^{3})$
体积：$10×8×5 - 2×2×2 = 392(cm^{3})$
表面积：$3×4 + 4×4 + 3×4÷2×2 + 4×5 = 60(m^{2})$
体积：$4×4×3÷2 = 24(m^{3})$
