a) \[-79 + 56 = -23\]
\[-58 + 85 = 27\]
\[-102 + 225 = 123\]
\[-39.5 + 65.7 = 26.2\]
\[-25.8 + 66 = 40.2\]
\[-73 + 56.9 = -16.1\]
\[-77.5 + 135.73 = 58.23\]
\[34 - (-76) = 34 + 76 = 110\]
\[54 - (-34) = 54 + 34 = 88\]
\[104 - (-56) = 104 + 56 = 160\]
\[346 - (-454) = 346 + 454 = 800\]
\[2.3 - (-7.7) = 2.3 + 7.7 = 10\]
\[6.8 - (-2.5) = 6.8 + 2.5 = 9.3\]
\[87.45 - (-49.7) = 87.45 + 49.7 = 137.15\]
\[103.04 - (-0.96) = 103.04 + 0.96 = 104\]
\[-34 + (-59) = -34 - 59 = -93\]
\[-56 + (-78) = -56 - 78 = -134\]
\[-132 + (-45) = -132 - 45 = -177\]
\[-448 + (-45) = -448 - 45 = -493\]
\[-6.2 + (-2.8) = -6.2 - 2.8 = -9\]
\[-3.04 + (-5.67) = -3.04 - 5.67 = -8.71\]
\[-203 + (-35.7) = -203 - 35.7 = -238.7\]
\[-1.5 + (-2.5) = -1.5 - 2.5 = -4\]
\[-25 - 36 = -61\]
\[-34 - 567 = -601\]
\[-256 - 345 = -601\]
\[-257 - 457 = -714\]
\[-2.03 - 7.99 = -10.02\]
\[-34.56 - 25.44 = -60\]
\[-0.56 - 9.07 = -9.63\]
\[-67.34 - 45.08 = -112.42\]
\[-47 - (-56) = -47 + 56 = 9\]
\[-103 - (-56) = -103 + 56 = -47\]
\[-87 - (-34) = -87 + 34 = -53\]
\[-254 - (-577) = -254 + 577 = 323\]
\[-0.69 - (-34) = -0.69 + 34 = 33.31\]
\[-8.09 - (-39.1) = -8.09 + 39.1 = 31.01\]
\[-5.06 - (-56) = -5.06 + 56 = 50.94\]
\[-5.3 - (-55.7) = -5.3 + 55.7 = 50.4\]
\[-2 \frac{2}{6} + (-3 \frac{1}{2}) = -5 - \frac{1}{12} + 2 = -3 \frac{7}{84}\]
\[-4 \frac{1}{3} - 2 \frac{7}{21} = -5 \frac{3}{7} = -1 \frac{1}{14}\]
Ответ: Решения выше.