一、口算。
$7 + 6 =$
$8 + 11 =$
$2 + 5 + 5 =$
$9 + 7 =$
$7 + 2 =$
$7 + 2 + 5 =$
$8 + 9 =$
$8 + 4 =$
$4 + 3 + 8 =$
$8 + 10 =$
$7 + 10 =$
$8 + 2 + 6 =$
$7 + 8 =$
$7 + 5 =$
$7 + 7 - 2 =$
$9 + 8 =$
$8 + 8 =$
$5 + 2 + 9 =$
$7 + 4 =$
$7 + 3 =$
$8 + 1 + 4 =$
$10 + 7 =$
$3 + 7 =$
$3 + 5 + 5 =$
$8 + 7 =$
$8 + 3 =$
$2 + 6 + 6 =$
$7 + 9 =$
$9 + 4 =$
$3 + 4 + 6 =$

一、13 19 12
16 9 14
17 12 15
18 17 16
15 12 12
17 16 16
11 10 13
17 10 13
15 11 14
16 13 13

二、连一连。

二、