算一算

10-4=        10+5=       9+9=          9-1-4=

7-3=4       19-10=         5+8=     2+6+6=

0+5=4      8+10=         7+6=      9-2+3=

6-3=      18-8=       6+5=       5+3-3=

4+6=       12+2=     8+7=      14-4-10=

1+7=         19-5=      9+8=        9-0+5=

2+8=       13+6=       4+9=      4+4+8=

6-2=       16-1=       6+6=        2+5+9=

9+1=           15-3=       2+9=       5+7-1=