9-2= | 1+6= | 10-7= | 10-5+4= |
10+5= | 14-4= | 19-10= | 4+6+6= |
6-6= | 3+7= | 2+6= | 10-4+10= |
8+2= | 3+10= | 8-8= | 8-7+7= |
5+( )=5 | 7+( )=17 | ( )+5=15 | 11-( )=1 |
( )+( )=( ) ( )+( )=( )
( )-( )=( ) ( )-( )=( )
够( ) 不够( )
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