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3. 连一连。
答案：
4. “心中”有数。
$10 + \heartsuit = 20$ $17 + \heartsuit = 20$ $\heartsuit + 6 = 12$
$\heartsuit + 3 = 18$ $16 + \heartsuit = 19$ $14 + \heartsuit = 15$
$10 + \heartsuit = 20$ $17 + \heartsuit = 20$ $\heartsuit + 6 = 12$
$\heartsuit + 3 = 18$ $16 + \heartsuit = 19$ $14 + \heartsuit = 15$
10 3 6 15 3 1
答案：
10 3 6 15 3 1
四、看图列算式。
1.
2.
3.
10 - 3 -
4.
6 - 2 +
1.
10
+5
=15
5
+10
=15
15
-5
=10
15
-10
=5
2.
12
+3
=15
(颗)3.
10 - 3 -
4
= 3
(根)4.
6 - 2 +
4
= 8
(颗)
答案：
1. 10+5=15 5+10=15 15-5=10 15-10=5 2. 12+3=15 3. 10-3-4=3 4. 6-2+4=8
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