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一、口算。
拍照批改
2.2 - 1.55 =
5.6 ÷ 0.7 =
62.5 × 80 =
0.73 + 1.5 =
$\frac{11}{12} - \frac{5}{8} =$
$\frac{5}{6} + \frac{11}{18} =$
$\frac{8}{7} - \frac{3}{4} =$
$\frac{3}{4} + \frac{1}{2} =$
拍照批改
2.2 - 1.55 =
0.65
6.9 ÷ 0.6 = 11.5
8.24 + 3.76 = 12
5.6 ÷ 0.7 =
8
4.1 - 3.8 = 0.3
0.6 × 0.15 = 0.09
62.5 × 80 =
5000
1 - 0.03 = 0.97
4.86 ÷ 0.9 = 5.4
0.73 + 1.5 =
2.23
250 × 0.04 = 10
1.68 + 2.43 = 4.11
$\frac{11}{12} - \frac{5}{8} =$
$\frac{7}{24}$
$\frac{5}{7} - \frac{10}{21} =$$\frac{5}{21}$
$\frac{13}{4} + \frac{5}{6} =$$\frac{49}{12}$
$\frac{5}{6} + \frac{11}{18} =$
$\frac{13}{9}$
$\frac{2}{5} + \frac{5}{12} =$$\frac{49}{60}$
$\frac{7}{10} - \frac{2}{5} =$$\frac{3}{10}$
$\frac{8}{7} - \frac{3}{4} =$
$\frac{11}{28}$
$\frac{5}{8} - \frac{1}{6} =$$\frac{11}{24}$
$\frac{2}{5} + \frac{3}{8} =$$\frac{31}{40}$
$\frac{3}{4} + \frac{1}{2} =$
$\frac{5}{4}$
$\frac{6}{7} - \frac{3}{10} =$$\frac{39}{70}$
$\frac{1}{3} - \frac{1}{5} =$$\frac{2}{15}$
答案
一、0.65 11.5 12
8 0.3 0.09
5000 0.97 5.4
2.23 10 4.11
$\frac{7}{24}$ $\frac{5}{21}$ $\frac{49}{12}$
$\frac{13}{9}$ $\frac{49}{60}$ $\frac{3}{10}$
$\frac{11}{28}$ $\frac{11}{24}$ $\frac{31}{40}$
$\frac{5}{4}$ $\frac{39}{70}$ $\frac{2}{15}$
8 0.3 0.09
5000 0.97 5.4
2.23 10 4.11
$\frac{7}{24}$ $\frac{5}{21}$ $\frac{49}{12}$
$\frac{13}{9}$ $\frac{49}{60}$ $\frac{3}{10}$
$\frac{11}{28}$ $\frac{11}{24}$ $\frac{31}{40}$
$\frac{5}{4}$ $\frac{39}{70}$ $\frac{2}{15}$
二、计算下面各图形的表面积和体积。
答案
二、表面积：(8.5×6 + 8.5×4 + 6×4)×2 = 218(cm²)
体积：8.5×6×4 = 204(cm³)
表面积：[6×4 + 6×2 + 2×2 + 4×(2 + 2)]×2 = 112(m²)
体积：6×4×2 + 2×4×2 = 64(m³)
体积：8.5×6×4 = 204(cm³)
表面积：[6×4 + 6×2 + 2×2 + 4×(2 + 2)]×2 = 112(m²)
体积：6×4×2 + 2×4×2 = 64(m³)
