1-600+640-650+640-600=1280-1850=-63021233×4321=1232×4321+43211232×4322=1232×4321+12323108/(130-9) *9=972/1214 5个513+15+4=32610=1+9=2+2*4=6+2*2=4+2*3=2*55种7猎手(890-360*2)/2=85狗 (360*4-890)/2=275