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//以下程序的运行结果是【1】____________。#includevoidnum(){externintx,y;inta=15,b=10;x=a-b;y=a+b;}intx,y;intmain(){inta=7,b=5;x=a+b;y=a-b;num();printf("%d,%d\n",x,y);return0;}

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