问题
解答题
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答案
+1 8
=5 8
; 3 4
+5 6
=1; 1 6
-9 14
=5 14
; 2 7
+11 25
=9 25
;4 5
+7 18
+1 18
=5 18
; 13 18
+7 10
-1 10
=1 10
; 7 10
-10 21
-8 21
=0; 2 21
-9 16
+5 16
=3 16
.7 16