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7.1/7*0,07-5.5/8*1,6=50/7*7/100-45/8*16/10=350/700-720/80=0,5-9=-8,5
-2,34*3.11/13+1,26*5,5/9=-234/100*311/100+126/100*50/9=72774/10000+6300/900=7,2774+7=14,2774