Question

(3/4 - 4/5) * 7.8 + (2/3 + 4/7 ) * 7/13 Помогите решить 

Answer 1

(3/4-4/5)*7,8+(2/3+4/7)*7/13=83/300

3/4-4/5=15/20-16/20=-1/20

-1/20*7,8=-0,05*7,8=-0,39

2/3+4/7=14/21+12/21=26/21

26/21*7/13=2/3

-0,39+2/3=-39/100+2/3=83/300