8•3 : 4= - 6, 8 : 4•2= - 4, 18 + 9 : 3= - 21, 32 + 4•2= - 40, 62 - 4•3= - 50, (24 - 8) : 2= - 8, 9•2 - 2•3= - 12, 5•3 + 3•3= - 24, (11 + 16) : 9= - 3, 90 - 5.15= - 15, 7.33 -33= - 198, 120 - 6.3= - 102, 3 . (4+12)= - 48, 30 : 6 + 257= - 262, 80 : 4 + 5.8= - 60,

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