《2025年速算天地数学口算心算五年级上册苏教版》

1-0.3=0.7
1-0.5=0.5
1-0.7=0.3
2-0.2=1.8
5-0.3=4.7
5-0.4=4.6
8-0.8=7.2
10.5-0.5=10
20-0.4=19.6
7-0.9=6.1
5-0.7=4.3
6-0.7=5.3
10-0.1=9.9
3-0.3=2.7
6-0.6=5.4
8-0.3=7.7
10-0.7=9.3
10-0.4=9.6
4-0.2=3.8
9-0.9=8.1
1-0.6=0.4
1+0.5=1.5
10+0.8=10.8
10-0.8=9.2
15+0.2=15.2
15-0.2=14.8
7+0.7=7.7
7-0.7=6.3
12+0.2=12.2
12-0.2=11.8
12.2-0.2=12
10-0.5=9.5
10+0.1=10.1
10.1-10=0.1
9.9-9=0.9
9.9-0.9=9
10-1.9=8.1
10+1.9=11.9
100+0.8=100.8
100-0.8=99.2

答案： 解析：这些题目都是基础的加减法运算，涉及到小数。需要我们将每个式子中的数字进行小数点对齐，然后进行相应的加法或减法运算。
答案：
1 - 0.3 = 0.7
1 - 0.5 = 0.5
1 - 0.7 = 0.3
2 - 0.2 = 1.8
5 - 0.3 = 4.7
5 - 0.4 = 4.6
8 - 0.8 = 7.2
10.5 - 0.5 = 10
20 - 0.4 = 19.6
7 - 0.9 = 6.1
5 - 0.7 = 4.3
6 - 0.7 = 5.3
10 - 0.1 = 9.9
3 - 0.3 = 2.7
6 - 0.6 = 5.4
8 - 0.3 = 7.7
10 - 0.7 = 9.3
10 - 0.4 = 9.6
4 - 0.2 = 3.8
9 - 0.9 = 8.1
1 - 0.6 = 0.4
1 + 0.5 = 1.5
10 + 0.8 = 10.8
10 - 0.8 = 9.2
15 + 0.2 = 15.2
15 - 0.2 = 14.8
7 + 0.7 = 7.7
7 - 0.7 = 6.3
12 + 0.2 = 12.2
12 - 0.2 = 11.8
12.2 - 0.2 = 12
10 - 0.5 = 9.5
10 + 0.1 = 10.1
10.1 - 10 = 0.1
9.9 - 9 = 0.9
9.9 - 0.9 = 9
10 - 1.9 = 8.1
10 + 1.9 = 11.9
100 + 0.8 = 100.8
100 - 0.8 = 99.2

1-0=
1-0.8=
1-0.9=
1-0.09=
1-0.29=
1-0.76=
1-0.36=
1-0.71=
1-0.62=
1-0.47=
1-0.45=
1-0.51=
1-0.39=
1-0.53=
1-0.77=
1-0.88=
1-0.99=
1-0.15=
1-0.01=
1-0.23=
1-1=
1-0.4=
1-0.2=
1-0.74=
1-0.33=
1-0.27=
1-0.64=
1-0.69=
1-0.37=
1-0.48=
1-0.08=
1-0.61=
1-0.31=
1-0.35=
1-0.44=
1-0.67=
1-0.33=
1+0.39=
1-0.87=
1+0.87=

答案： 解析：这些题目都是基础的减法（和两个加法）运算，主要考查学生的口算能力。
答案：
1 - 0 = 1
1 - 0.8 = 0.2
1 - 0.9 = 0.1
1 - 0.09 = 0.91
1 - 0.29 = 0.71
1 - 0.76 = 0.24
1 - 0.36 = 0.64
1 - 0.71 = 0.29
1 - 0.62 = 0.38
1 - 0.47 = 0.53
1 - 0.45 = 0.55
1 - 0.51 = 0.49
1 - 0.39 = 0.61
1 - 0.53 = 0.47
1 - 0.77 = 0.23
1 - 0.88 = 0.12
1 - 0.99 = 0.01
1 - 0.15 = 0.85
1 - 0.01 = 0.99
1 - 0.23 = 0.77
1 - 1 = 0
1 - 0.4 = 0.6
1 - 0.2 = 0.8
1 - 0.74 = 0.26
1 - 0.33 = 0.67
1 - 0.27 = 0.73
1 - 0.64 = 0.36
1 - 0.69 = 0.31
1 - 0.37 = 0.63
1 - 0.48 = 0.52
1 - 0.08 = 0.92
1 - 0.61 = 0.39
1 - 0.31 = 0.69
1 - 0.35 = 0.65
1 - 0.44 = 0.56
1 - 0.67 = 0.33
1 - 0.33 = 0.67
1 + 0.39 = 1.39
1 - 0.87 = 0.13
1 + 0.87 = 1.87