(-2целых 1/8)•(-1целых 29/51)+(-1целых 23/42)

(-2целых 1/8)•(-1целых 29/51)+(-1целых 23/42)=

(2·8+1)/8  ·(51+29)/51-(42+23)/42=(17/8)·(80/51)-65/42=(17·80)/(8·51)-65/42=
= 10/3-65/42 =10·14/(3·14)-65/42=(140-65)/42=75/42= 25/14=1 целая 11/14 

(-2+1/8)•(-129/51)+(-1+23/42)=-5