一、口算。
$4.22 + 8.4 = $
$3.72 ÷ 0.4 = $
$0.23 × 400 = $
$8.6 ÷ 0.4 = $
$4.25 ÷ 0.5 = $
$7.5 - 4.9 = $
$1.57 - 0.32 = $
$7.65 ÷ 0.9 = $
$4.22 + 8.4 = $
12.62
$1.2m × 10 = $12m
$0.62 × 0.5 = $0.31
$3.72 ÷ 0.4 = $
9.3
$0.12 × 0.5 = $0.06
$4.65 - 1.5 = $3.15
$0.23 × 400 = $
92
$7.5 ÷ 0.5 = $15
$0.5 × 0.8 = $0.4
$8.6 ÷ 0.4 = $
21.5
$0.2 × 0.47 = $0.094
$10.8 ÷ 0.9 = $12
$4.25 ÷ 0.5 = $
8.5
$0.48 × 1.25 = $0.6
$2.4 × 0.8 = $1.92
$7.5 - 4.9 = $
2.6
$0.36 ÷ 1.2 = $0.3
$7.7n ÷ 1.1 = $7n
$1.57 - 0.32 = $
1.25
$9.25 + 2.25 = $11.5
$1.4 × 2 = $2.8
$7.65 ÷ 0.9 = $
8.5
$0.46 × 0.4 = $0.184
$0.84 ÷ 0.8 = $1.05
答案
12.62 12m 0.31 9.3 0.06 3.15 92 15 0.4 21.5 0.094 12 8.5 0.6 1.92 2.6 0.3 7n 1.25 11.5 2.8 8.5 0.184 1.05
二、计算下面图形的面积。

答案
28×20-20×14÷2-10×(28-14)÷2= 350(cm²) (5+8)×5÷2+8×4÷2-(3+5)×3.2÷2= 35.7(m²)
解析
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