1. (2023一上·南沙期末) 我会算

7+2=           9-3=          5+9=              10+9=

13-3=           7-7=          8+4=              9-8=

6+6=           7-4=           6+7=              13+2=

10-0=           16-5=         8+9=              9+4=

19-5=            7+5=         12+3=             17-10=

7+3+8=        13-2+7=        10-3+4=      10+4-2=

18-8+3=        5+8-2=