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
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
2)5
3) 6/13
4)3/10