50×9-480÷(348-268)×12= 420÷7+640÷8-25×5= (8+9)×5-360÷6÷10= 429-18-36÷(34-25)=

348-268=80..50×9=450.,480÷80=6.,6×12=72.,450-72=378
420÷7=60.,640÷8=80.,25×5=125.,60+80=140.,140-125=15 
8+9=17.,17×5=85.,360÷6=60.,60÷10=6.,85-6=79
34-25=9.,36÷9=4.,429-18=411.,411-9=402