1. 直接写出得数。
2.6 - 1.7 =
0.14 ÷ 7 =
72 ÷ 90 =
126 ÷ 6 × 5 =
6.4 ÷ 4 =
8.5 + 85 =
1.43 + 2.6 =
25 × (40 - 32) =
1 - 0.93 =
6.5 × 20 =
4.5 × 200 =
978 - (78 + 335) =
0.5 × 6 =
8.5 ÷ 17 =
1.25 ÷ 25 =
30 × 50 ÷ 3 =
1.1 × 7 =
19 + 1.91 =
12.6 × 3 =
23 × 100 ÷ 1000 =
8.5 × 20 =
0.87 - 0.8 =
44.1 - 4.2 =
35 + 35 ÷ 7 =
9.8 - 0.98 =
3.6 × 40 =
10.65 ÷ 5 =
5.3 - 4.2 + 0.7 =
0.93 ÷ 31 =
0.71 + 0.09 =
0.31 × 3 =
(18 + 9) ÷ 90 =

1. 0.9
0.02
0.8
105
1.6
93.5
4.03
200
0.07
130
900
565
3
0.5
0.05
500
7.7
20.91
37.8
2.3
170
0.07
39.9
40
8.82
144
2.13
1.8
0.03
0.8
0.93
0.3

2. 用竖式计算。
6.06×48=
3.98×45=
16.25÷25=
7.8×25=
75.4÷26=
3.264÷32=

2. 290.88
179.1
0.65
195
2.9
0.102
竖式略

已知A、B、C是三个不同的质数，且$A+B+C=48$，则$A×B×C$的值最小是多少？最大是多少？

48-2=46
46=3+43=5+41=17+29
最小:2×3×43=258
最大:2×17×29=986