Ответ:\(0 - 7.8 = -7.8\)\(0 - (-2.9) = 2.9\)\(-4.5 - 2.5 = -7\)\(8 \cdot (-0.4) = -3.2\)\(12 \cdot (-0.5) = -6\)Ответ: −7,8; 2,9; −7; −3,2; −6.