1) Если $$m = 8,93$$, то $$8,93 + (-5,4) = 8,93 - 5,4 = 3,53$$
2) Если $$m = -3\frac{5}{6}$$, то $$-3\frac{5}{6} + (-5,4) = -3\frac{5}{6} - 5,4 = -3\frac{5}{6} - 5\frac{4}{10} = -3\frac{25}{30} - 5\frac{12}{30} = -8\frac{37}{30} = -9\frac{7}{30}$$
3) Если $$m = -10$$, то $$-10 + (-5,4) = -10 - 5,4 = -15,4$$
4) Если $$m = 2\frac{7}{40}$$, то $$2\frac{7}{40} + (-5,4) = 2\frac{7}{40} - 5,4 = 2\frac{7}{40} - 5\frac{4}{10} = 2\frac{7}{40} - 5\frac{16}{40} = -3\frac{9}{40}$$
Ответы:
1) 3,53
2) $$-9\frac{7}{30}$$
3) -15,4
4) $$-3\frac{9}{40}$$