9+2=____  10+1=____          9+7=____              10+____=____

9+3=____  10+2=____          9+____=____          ____+____=____

9+4=____  10+3=____          9+____= ____         ____+____=____

9+5=____  10+____=____      ____+____=____      ____+____=____

9+6=____  10+____=____            ……                     ……

中南半岛的城市多分布在（    ）