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一、口算。
$4 + 5 =$ $18 - 9 =$ $7 - 4 + 15 =$
$4 + 8 =$ $8 + 9 =$ $3 + 5 + 8 =$
$7 + 7 =$ $14 - 9 =$ $11 - 2 + 7 =$
$12 - 9 =$ $9 + 6 =$ $14 + 2 - 8 =$
$9 + 5 =$ $11 - 3 =$ $12 - 5 + 6 =$
$19 - 7 =$ $7 + 5 =$ $18 - 4 - 6 =$
$6 + 10 =$ $14 - 4 =$ $12 + 4 - 9 =$
$18 + 0 =$ $2 + 16 =$ $13 - 6 + 8 =$
$6 + 6 =$ $19 - 2 =$ $12 - 6 - 4 =$
$7 - 7 =$ $11 - 8 =$ $4 + 5 + 8 =$
$4 + 5 =$ $18 - 9 =$ $7 - 4 + 15 =$
$4 + 8 =$ $8 + 9 =$ $3 + 5 + 8 =$
$7 + 7 =$ $14 - 9 =$ $11 - 2 + 7 =$
$12 - 9 =$ $9 + 6 =$ $14 + 2 - 8 =$
$9 + 5 =$ $11 - 3 =$ $12 - 5 + 6 =$
$19 - 7 =$ $7 + 5 =$ $18 - 4 - 6 =$
$6 + 10 =$ $14 - 4 =$ $12 + 4 - 9 =$
$18 + 0 =$ $2 + 16 =$ $13 - 6 + 8 =$
$6 + 6 =$ $19 - 2 =$ $12 - 6 - 4 =$
$7 - 7 =$ $11 - 8 =$ $4 + 5 + 8 =$
答案
一、9 9 18 12 17 16 14 5 16 3 15 8 14 8 13 12 12 8 16 10 7 18 18 15 12 17 2 0 3 17
二、（
（
$11 -$（
（
14
）里最小能填几？（
14
）$- 8 ＞ 5$ $3 +$（10
）$＞ 12$ （7
）$+ 9 ＞ 5 + 10$$11 -$（
8
）$＜ 4$ （15
）$- 5 ＞ 9$ $15 -$（9
）$＜ 10 - 3$（
9
）$+ 8 ＞ 16$ $13 -$（8
）$＜ 6$ （13
）$- 7 ＞ 11 - 6$答案
二、14 10 7 8 15 9 9 8 13
