Номер 493 помогите плз

1) $5,6-(7,6-(-4,8))= 5,6-7,6+(-4,8)=-2-4,8=-6,8$
2) $52,3-(-18,9-24,5)=52,3+18,9+24,5=71,2+24,5=95,7.$
3) $- \frac{5}{6} -(- \frac{7}{9} -(- \frac{5}{8} ))=- \frac{5}{6}+\frac{7}{9}-\frac{5}{8}= - \frac{1}{18} - \frac{5}{8}=- \frac{49}{72} .$
4) $-7 \frac{3}{16}-(2 \frac{1}{8} -(- 7\frac{7}{12} ))=-7 \frac{3}{16}-2 \frac{1}{8}-7\frac{7}{12} =-9 \frac{5}{16} -7\frac{7}{12} =-16 \frac{43}{48} .$