a) -35 + (-24) = -59
б) -147 + (-256) = -403
в) -17,2 + (-5,9) = -23,1
г) -0,48 + (-0,76) = -1,24
д) -4$$\frac{5}{7}$$ + (-1$$\frac{6}{7}$$) = -4$$\frac{5}{7}$$ - 1$$\frac{6}{7}$$ = -5$$\frac{11}{7}$$ = -6$$\frac{4}{7}$$
е) -$$\frac{4}{5}$$ + (-$$\frac{4}{7}$$) = -$$\frac{4}{5}$$ - $$\frac{4}{7}$$ = -$$\frac{4 \times 7}{5 \times 7}$$ - $$\frac{4 \times 5}{7 \times 5}$$ = -$$\frac{28}{35}$$ - $$\frac{20}{35}$$ = -$$\frac{48}{35}$$ = -1$$\frac{13}{35}$$
ж) -$$\frac{5}{18}$$ + (-$$\frac{4}{45}$$) = -$$\frac{5}{18}$$ - $$\frac{4}{45}$$ = -$$\frac{5 \times 5}{18 \times 5}$$ - $$\frac{4 \times 2}{45 \times 2}$$ = -$$\frac{25}{90}$$ - $$\frac{8}{90}$$ = -$$\frac{33}{90}$$ = -$$\frac{11}{30}$$
з) -4$$\frac{9}{14}$$ + (-3$$\frac{4}{21}$$) = -4$$\frac{9}{14}$$ - 3$$\frac{4}{21}$$ = -4$$\frac{9 \times 3}{14 \times 3}$$ - 3$$\frac{4 \times 2}{21 \times 2}$$ = -4$$\frac{27}{42}$$ - 3$$\frac{8}{42}$$ = -7$$\frac{35}{42}$$ = -7$$\frac{5}{6}$$
Ответ:
a) -59;
б) -403;
в) -23,1;
г) -1,24;
д) -6$$\frac{4}{7}$$;
е) -1$$\frac{13}{35}$$;
ж) -$$\frac{11}{30}$$;
з) -7$$\frac{5}{6}$$