=«f
(
)
-8=7
(
)-8=8
(
)
-12=8
(
)
-12=6
(
)
-6=12
(
)-7=7
(
)
-4=15
(
)
-15=2
(
)
-7=6=«f
(
)
-8=7
(
)-8=8
(
)
-12=8
(
)
-12=6
(
)
-6=12
(
)-7=7
(
)
-4=15
(
)
-15=2
(
)
-7=6
(
)-6=13
(
)
-8=12
(
)
-8=5
(
)
-9=4
(
)-6=9
(
)
-9=11
(
)
-9=7
(
)
-7=4
(
)-5=6
(
)
-1=15
(
)
-6=13
(
)
-6=8
(
)-12=7
(
)
-7=5
(
)
-8=7
(
)
-5=7
(
)-13=6
(
)
-8=6
(
)
-11=6
(
)
-3=9
(
)-11=9
(
)
-7=11
(
)
-4=12
(
)-9=5
(
)
-12=6
(
)
-8=3
(
)-14=5
(
)
-5=6
(
)
-7=5
(
)-11=7
(
)
-13=4
=被减到
(-差
15-
(
)=6
13-
(
)=11
11-(
(
)=4
12-
(
)=8
16-
(
)=5
11-
(
)=7
12-(
(
)=8
11-(
(
)=9
18-
(
)=12
12-(
(
)=6
16-(
(
)=4
13-(
(
)=5
19-
(
)=11
14-(
(
)=7
18-(
(
)=3
16-(
(
)=4
13-
(
)=8
18-(
(
)=9
17-(
(
)=6
17-(
(
)=9
17-
(
)=4
19-(
(
)=11
17-(
(
)=8
15-(
(
)=6
15-
(
)=8
11-(
(
)=8
14-(
(
)=5
14-(
(
)=5
14-
(
)=9
15-(
(
)=4
19-(
(
)=13
18-(
(
)=3
18-
(
)=8
13-(
(
)=6
13-(
(
)=8
14-(
(
)=11
17-
(
)=10
12-(
(
)=3
14-(
(
)=4
16-(
(
)=8
加数=和-另一个加数
(
)
+8=12
(
)
+4=8
(
)
+9=13
(
)
+8=17
(
)
+7=
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