一、直接写出得数。
8.27÷10 = 300×0.08 = 4.3 - 3.3 =
2.4×5 = 2 - 0.46 = 0.56÷28 =
0.73 + 0.57 = 13.6÷4 = 0.954 - 0.57 =
0.9÷0.5 = 2.09×100 = 13.8×20 =
8.73 - 4.6 = 9.5÷5 = 15.9 + 3.1 =
3.4×0.4 = 0.74 - 0.34 = 25÷0.5 =
0.45×0.9 = 2.5 - 1.37 = 5.6÷28 =
8.27÷10 = 300×0.08 = 4.3 - 3.3 =
2.4×5 = 2 - 0.46 = 0.56÷28 =
0.73 + 0.57 = 13.6÷4 = 0.954 - 0.57 =
0.9÷0.5 = 2.09×100 = 13.8×20 =
8.73 - 4.6 = 9.5÷5 = 15.9 + 3.1 =
3.4×0.4 = 0.74 - 0.34 = 25÷0.5 =
0.45×0.9 = 2.5 - 1.37 = 5.6÷28 =
答案:
0.827 24 1
@@12 1.54 0.02
@@1.3 3.4 0.384
@@1.8 209 276
@@4.13 1.9 19
@@1.36 0.4 50
@@0.405 1.13 0.2
@@12 1.54 0.02
@@1.3 3.4 0.384
@@1.8 209 276
@@4.13 1.9 19
@@1.36 0.4 50
@@0.405 1.13 0.2
二、列竖式计算。
16.4×2.3 = 7.7×43 = 65×7.7 =

0.34×0.17 = 7.3×4.5 = 7.2×4.6 =
16.4×2.3 = 7.7×43 = 65×7.7 =
0.34×0.17 = 7.3×4.5 = 7.2×4.6 =
答案:
37.72 331.1 500.5
@@0.0578 32.85 33.12
@@0.0578 32.85 33.12
三、求下面图形的表面积和棱长和。

答案:
1. 表面积:
$6×6×6 = 216(cm^{2})$
棱长和:$6×12 = 72(cm)$
2. 表面积:$(8×2 + 2×5 + 8×5)×2 = 132(cm^{2})$
棱长和:
$(8 + 2 + 5)×4 = 60(cm)$
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