1)(3 1/2:4 2/3+4 2/3:3 1/2)* 4 4/5=
(7/2*3/14+14/3*2/7)*24/5=
(3/4+4/3)*24/5=
(9/12+16/12)*24/5=25/12*24/5=10
2)(11 5/11-8 21/22):1 2/3=
(2 16/11-21/22)*3/5=
(2 32/22-21/22)*3/5=
2 11/22*3/5=55/22*3/5=3/2=1 1/2
3)(1 1/2-3/4):7/8=
(3/2-3/4)*8/7=
(6/4-3/4)*8/7=3/4*8/7=6/7