Давай решим эти примеры по порядку!
1) \(-14 + (-8)\) = \(-14 - 8\) = \(-22\)
2) \(-6 + (-15)\) = \(-6 - 15\) = \(-21\)
3) \(-5.9 + (-2.7)\) = \(-5.9 - 2.7\) = \(-8.6\)
4) \(-3.14 + (-3.14)\) = \(-3.14 - 3.14\) = \(-6.28\)
5) \(-2.8 + (-16)\) = \(-2.8 - 16\) = \(-18.8\)
6) \(-\frac{4}{7} + (-\frac{3}{7})\) = \(-\frac{4}{7} - \frac{3}{7}\) = \(-\frac{7}{7}\) = \(-1\)
7) \(-\frac{15}{8} + (-\frac{2}{9})^2\) = \(-\frac{15}{8} + \frac{4}{81}\) = \(-\frac{15 \cdot 81}{8 \cdot 81} + \frac{4 \cdot 8}{81 \cdot 8}\) = \(-\frac{1215}{648} + \frac{32}{648}\) = \(-\frac{1183}{648}\)
8) \(-4 \frac{7}{12} + (-3 \frac{4}{5})\) = \(-4 \frac{7}{12} - 3 \frac{4}{5}\) = \(-\frac{55}{12} - \frac{19}{5}\) = \(-\frac{55 \cdot 5}{12 \cdot 5} - \frac{19 \cdot 12}{5 \cdot 12}\) = \(-\frac{275}{60} - \frac{228}{60}\) = \(-\frac{503}{60}\) = \(-8 \frac{23}{60}\)
Ответ: 1) -22; 2) -21; 3) -8.6; 4) -6.28; 5) -18.8; 6) -1; 7) -1183/648; 8) -503/60
Ты отлично справился! Не останавливайся на достигнутом, и все получится!