2)(6-4 8/15)÷2,2=(5 15/15-4 8/15)÷2,2=1 7/15÷22/10=22/15×10/22=2/3
4)(5,4-2 1/3)÷7 2/3=(5 2/5-2 1/3)÷7 2/3=(5 6/15-2 5/15)÷7 2/3=3 1/15÷7 2/3=46/15×3/23=2/5
6)(7,6-4 3/4)÷1,9=(7 3/5-4 3/4)÷1,9=(7 12/20-4 15/20)÷1,9=(6 32/20-4 15/20)÷1,9=2 17/20÷1,9=2,85÷1,9=1,5