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连减运算练习
17
+4
-8
=
13
+17
-3
=
15
-8
+6
=
13
+12
+16
=
3
+4
+19
=
5
+8
-13
=
12
-4
+1
=
16
+8
+19
=
16
+18
-4
=
14
-2
+14
=
8
+10
-4
=
8
+19
-3
=
17
+17
+7
=
4
+10
-2
=
9
+10
+11
=
12
+6
+18
=
6
+13
-12
=
17
-13
+15
=
11
+13
-15
=
10
+15
+7
=
5
+5
+16
=
2
+3
-5
=
9
+2
+17
=
8
+3
+10
=
11
+18
-3
=
15
+15
-8
=
11
+10
+11
=
16
-10
+7
=
18
+12
+5
=
17
-5
+17
=
12
+10
+9
=
8
-6
+13
=
9
+3
+3
=
15
+3
-18
=
13
+13
-14
=
18
+19
+11
=
16
+16
-3
=
9
+5
+10
=
16
+4
+9
=
9
+15
+12
=
6
+16
+2
=
10
-1
+16
=
5
+16
+9
=
14
+8
+10
=
15
-3
+11
=
16
-14
+6
=
10
+2
-12
=
15
-10
+11
=
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