登录
一、口算。
$4.9 - 0.15 = $
$52.8 + 0.4 = $
$5.4 - 0.52 = $
$10.3 + 2.5 = $
$6.84 + 0.15 = $
$0.49 + 0.72 = $
$25.4 - 3.2 = $
$1.87 - 0.97 = $
$0.65 - 0.6 = $
$2.95 - 1.8 = $
$1.6 - 1.05 = $
$1.5 + 0.05 = $
$3.4 + 7 = $
$0.71 + 0.25 = $
$2.45 + 0.3 = $
$0.18 + 0.17 = $
$0.88 - 0.8 = $
$7.12 + 0.08 = $
$10 - 3.8 = $
$0.35 + 0.8 = $
$2.85 + 1.2 = $
$5.8 + 0.84 = $
$1.04 + 2.68 = $
$2.5 + 0.53 = $
$4.9 - 0.15 = $
4.75
$52.8 + 0.4 = $
53.2
$5.4 - 0.52 = $
4.88
$10.3 + 2.5 = $
12.8
$6.84 + 0.15 = $
6.99
$0.49 + 0.72 = $
1.21
$25.4 - 3.2 = $
22.2
$1.87 - 0.97 = $
0.9
$0.65 - 0.6 = $
0.05
$2.95 - 1.8 = $
1.15
$1.6 - 1.05 = $
0.55
$1.5 + 0.05 = $
1.55
$3.4 + 7 = $
10.4
$0.71 + 0.25 = $
0.96
$2.45 + 0.3 = $
2.75
$0.18 + 0.17 = $
0.35
$0.88 - 0.8 = $
0.08
$7.12 + 0.08 = $
7.2
$10 - 3.8 = $
6.2
$0.35 + 0.8 = $
1.15
$2.85 + 1.2 = $
4.05
$5.8 + 0.84 = $
6.64
$1.04 + 2.68 = $
3.72
$2.5 + 0.53 = $
3.03
答案
4.75 53.2 4.88
12.8 6.99 1.21
22.2 0.9 0.05
1.15 0.55 1.55
10.4 0.96 2.75
0.35 0.08 7.2
6.2 1.15 4.05
6.64 3.72 3.03
12.8 6.99 1.21
22.2 0.9 0.05
1.15 0.55 1.55
10.4 0.96 2.75
0.35 0.08 7.2
6.2 1.15 4.05
6.64 3.72 3.03
二、计算下面图形的面积。
答案
12×8-(4+8)×4÷2=72(cm²)
4×4÷2+6×6÷2+(7+4+6)×6÷2=77(dm²)
4×4÷2+6×6÷2+(7+4+6)×6÷2=77(dm²)
