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

1.11
2.0
3.15
4.13
5.2
6.10
7.13
8.17
9.15
10.1
11.10
12.19
13.8
14.19
15.10
16.17
17.14
18.11
19.14
20.15
21.18
22.2
23.7
24.19
25.3
26.19
27.11
28.17
29.17
30.6

二、连一连。
11+2
19-8+6
12+4-1
13

17
14+3
17-6+2
10+2+3