10道简便运算：
25 + 13 = 38
48 - 17 = 31
7 x 8 = 56
84 ÷ 6 = 14
16 x 4 = 64
90 ÷ 9 = 10
35 + 22 = 57
63 - 29 = 34
9 x 6 = 54
72 ÷ 8 = 9
10道小数乘法：
2.5 x 1.5 = 3.75
0.8 x 0.6 = 0.48
3.33 x 2.5 = 8.325
1.25 x 0.4 = 0.5
0.05 x 0.03 = 0.0015
2.3 x 1.2 = 2.76
0.24 x 0.5 = 0.12
1.75 x 0.6 = 1.05
0.02 x 0.07 = 0.0014
0.15 x 0.4 = 0.06
10道整数减小数：
8 - 1.5 = 6.5
12 - 3.2 = 8.8
20 - 4.5 = 15.5
30 - 6.25 = 23.75
45 - 7.8 = 37.2
50 - 9.6 = 40.4
65 - 10.25 = 54.75
70 - 12.5 = 57.5
80 - 15.75 = 64.25
90 - 18.2 = 71.8