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一、口算。
$2.32 - 0.4 = $
$1.32 ÷ 0.3 = $
$4.2 ÷ 0.7 - 4.5 = $
$1.25 + 0.5 = $
$1.29 ÷ 3 = $
$0.2 × 0.4 × 0.5 = $
$3.5 × 0.8 = $
$8.4 ÷ 0.42 = $
$15 ÷ (2.4 - 0.9) = $
$0.81 ÷ 3 = $
$0.728 - 0.28 = $
$1 - 0.01 - 0.99 = $
$8 × 5.1 = $
$4.2 × 3 = $
$4.8 × 0.2 × 0.5 = $
$2.01 + 3.9 = $
$1.8 ÷ 0.45 = $
$1.9 + 5.1 ÷ 51 = $
$1.82 - 0.63 = $
$7y × 5 = $
$13 - 0.5 - 4 = $
$10a + 0.1a = $
$2.72 + 3.18 = $
$4.8 - 4.8 × 0.1 = $
$2.32 - 0.4 = $
1.92
$1.32 ÷ 0.3 = $
4.4
$4.2 ÷ 0.7 - 4.5 = $
1.5
$1.25 + 0.5 = $
1.75
$1.29 ÷ 3 = $
0.43
$0.2 × 0.4 × 0.5 = $
0.04
$3.5 × 0.8 = $
2.8
$8.4 ÷ 0.42 = $
20
$15 ÷ (2.4 - 0.9) = $
10
$0.81 ÷ 3 = $
0.27
$0.728 - 0.28 = $
0.448
$1 - 0.01 - 0.99 = $
0
$8 × 5.1 = $
40.8
$4.2 × 3 = $
12.6
$4.8 × 0.2 × 0.5 = $
0.48
$2.01 + 3.9 = $
5.91
$1.8 ÷ 0.45 = $
4
$1.9 + 5.1 ÷ 51 = $
2
$1.82 - 0.63 = $
1.19
$7y × 5 = $
35y
$13 - 0.5 - 4 = $
8.5
$10a + 0.1a = $
10.1a
$2.72 + 3.18 = $
5.9
$4.8 - 4.8 × 0.1 = $
4.32
答案
1.92 4.4 1.5 1.75 0.43 0.04 2.8 20 10 0.27 0.448 0 40.8 12.6 0.48 5.91 4 2 1.19 35y 8.5 10.1a 5.9 4.32
二、计算下面图形的面积。(每相邻两点之间的距离表示 1 cm)
答案
14÷2+4-1=10(cm²) 15÷2+1-1=7.5(cm²)
解析
