8*4/11+8*7/11 5*1/7+5*6/7 2/5*6/13+1/4*6/13

Ответ:

Пошаговое объяснение:

8*4/11+8*7/11 =8*(4/11+7/11)=8*1=8

5*1/7+5*6/7 =5*(1/7+6/7)=5*1=5

2/5*6/13+1/4*6/13=6/13*(2/5+1/4)=6/13*

(8/20+5/20)=6/13*13/20=6/20=3/10