灰气球有8个,白气球有多少个?
5+=13 8+=11 6+=15
9+=17 7+=14 4+=12
、、、、、
5+=11
+6=15
3+=11
12 – 7 = 12 – 4 = 12 – 9 = 12 – 6 =
13 – 5 = 13 – 9 = 13 – 7 = 13 – 4 =
- |
11 |
13 |
17 |
12 |
16 |
14 |
15 |
6 |
5 |
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9 |
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5 |
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8 |
+2=3 5+=8 +7=13
9-=5 8+=15 6+=10
-5=10 4+=11 14-=4
7+=15 19-=
15-810 11-311-4 18-912-2
13-95 15-1014-9 13-713-6
15-79 14-76 11-65
16-86 12-57 14-94
+= +=
-= -=