一、在 $□$ 里填合适的数。
$□ + 3 = 6$
$5 + □ = 9$
$□ + 10 = 10$
$5 + □ = 7$
$9 - □ = 4$
$□ - 7 = 3$
$5 + □ = 10$
$□ + 7 = 8$
$2 + □ = 6$
$9 + □ = 9$
$3 + □ = 4$
$3 + □ = 5$
$□ + 6 = 8$
$□ + 7 = 10$
$4 + 6 = 3 + □$
$6 - 2 = 2 + □$
$10 - 7 = 3 + □$
$4 + 5 = 5 + □$
$9 - 6 = □ + 2$
$3 + 6 = 4 + □$
$6 + 2 + □ = 9$
$4 - 3 + □ = 8$
$5 + □ - 2 = 6$
$8 - 3 + □ = 10$
$2 + 5 - □ = 3$
$7 - □ + 1 = 2$
$8 - 5 - □ = 2$
$9 - □ - 1 = 6$
$4 + □ + 3 = 10$
$5 + 5 - □ = 7$

1.3
2.4
3.0
4.2
5.5
6.10
7.5
8.1
9.4
10.0
11.1
12.2
13.2
14.3
15.7
16.2
17.0
18.4
19.1
20.5
21.1
22.7
23.3
24.5
25.4
26.6
27.1
28.2
29.3
30.3

二、在○里填数，使每条线上三个数连加都等于10。