а) (16,5 - 13 7/9) * 6/11 +2,2(8/33 - 1/11) + 3 2/11=3 2/3
16,5 - 13 7/9=16 1/2-13 7/9=33/2-124/9=
=(33*9-124*2)/18=(297-248)/4/18=49/18
49/18*6/11=49/33
8/33 - 1/11=(8-1*3)/33=5/33
2,2*5/33=2 1/5*5/33=11/5*5/33=1/3
5/33+1/3+3 2/11=5/33+1/3+35/11=
=(5+1*11+35*3)/33=121/33=3 22/33=3 2/3