一、口算。
$14+3=$
$17-2=$
$18-5=$
$10+9=$
$11+4=$
$19-6=$
$5+12=$
$13-10=$
$13+3=$
$8+10=$
$13+2=$
$19-10=$
$4+10=$
$15-2=$
$12-10=$
$18-3=$
$15-1=$
$18-8=$
$4+12=$
$14-4=$
$12+2-1=$
$13-2+5=$
$15+3-7=$
$12-2+6=$
$16-3-2=$
$19-7+2=$
$13+4-6=$
$6+12-4=$
$16-4+5=$
$10+3+3=$

1.17
2.15
3.13
4.19
5.15
6.13
7.17
8.3
9.16
10.18
11.15
12.9
13.14
14.13
15.2
16.15
17.14
18.10
19.16
20.10
21.13
22.16
23.11
24.16
25.11
26.14
27.11
28.14
29.17
30.16

二、在$□$里填合适的数。
$13+□=14$
$2+□=14$
$□-3=12$
$□+4=14$
$18-□=11$
$15-□=11$
$□-5=14$
$□+3=16$
$□+3+6=19$
$18-8-□=2$
$□-5+3=17$
$3+□-4=6$

1.1
2.12
3.15
4.10
5.7
6.4
7.19
8.13
9.10
10.8
11.19
12.7