(0,027: (9/10)2+0,09×10/27)×0,03+0,998= ((2.2/3)3÷28.4/9+2,2)×75/96-4,25-5/7= (1.2/3)3×(3/5)2+(21,36-20,4)÷0,06-16.16/21= !

2) (2 2/3)³ ÷ 28 4/9=(8/3)³:256/9=512/27*9/256=2/3
2/3+2.2=2/3+11/5=10/15+33/15=43/15
43/15*75/96=5/2=2.5
2.5-4.25=-1.75
-1.75-5/7=-7/4-5/7=-49/28-20/48=-69/48=-1 7/16
3) 
1 не смог