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一、我会计算。
$17 - 9 = $
$16 - 9 = $
$12 - 9 = $
$4 + 12 = $
$17 - 9 = $
8
$9 + 8 = $17
$13 - 9 = $4
$6 + 8 - 9 = $5
$16 - 9 = $
7
$11 - 9 = $2
$19 - 6 = $13
$18 - 9 + 6 = $15
$12 - 9 = $
3
$9 + 7 = $16
$18 - 4 = $14
$15 - 9 + 8 = $14
$4 + 12 = $
16
$5 + 9 = $14
$3 + 13 = $16
$5 + 6 - 9 = $2
答案：
8 17 4 5 7 2 13 15 3 16 14 14 16 14 16 2
二、圈一圈,算一算。
1.
$14 - 8 = $
想：$10 - 8 = 2$ $2 + $
2.
$11 - 8 = $
想：$10 - 8 = 2$ $2 + $
1.
$14 - 8 = $
6
想：$10 - 8 = 2$ $2 + $
4
$ = $6
或 $8 + $6
$ = 14$ $14 - 8 = $6
2.
$11 - 8 = $
3
想：$10 - 8 = 2$ $2 + $
1
$ = $3
或 $8 + $3
$ = 11$ $11 - 8 = $3
答案：
1. $14 - 8 = 6$
想：$10 - 8 = 2$，$2 + 4 = 6$；或$8 + 6 = 14$，$14 - 8 = 6$。
2. $11 - 8 = 3$
想：$10 - 8 = 2$，$2 + 1 = 3$；或$8 + 3 = 11$，$11 - 8 = 3$。
故答案依次为：$6$；$4$；$6$；$6$；$6$；$3$；$1$；$3$；$3$；$3$。
想：$10 - 8 = 2$，$2 + 4 = 6$；或$8 + 6 = 14$，$14 - 8 = 6$。
2. $11 - 8 = 3$
想：$10 - 8 = 2$，$2 + 1 = 3$；或$8 + 3 = 11$，$11 - 8 = 3$。
故答案依次为：$6$；$4$；$6$；$6$；$6$；$3$；$1$；$3$；$3$；$3$。
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