1) 7 7/11*3 2/5+7 7/11*7 3/5,2) 8 3/5*6 1/7 -1 1/7*8 3/5, 3) 10 5/11*4 1/3+10 5/11*6 2/3

1) 7 7/11*3 2/5+7 7/11*7 3/5=по действиям 84/11*17/5=1428/55 84/11*38/5=3192/551428/55+3192/55=4620/55=842) 8 3/5*6 1/7 -1 1/7*8 3/5=43/5*43/7=1849/35 8/7*43/5=344/351849/35 -344/35=1505/35=433) 10 5/11*4 1/3+10 5/11*6 2/3=115/11*13/3=1495/33 115/11*20/3=2300/331495/33+2300/33=3795/33=115