1) -3 1/3 -1 1/6 = -10/3-11/6=-20/6-11/6=-31/6=-5 1/6;
2) (5,75-6,9)-(-1/4+1/10)= -1,15-1/4-1/10= -115/100-1/4-1/10= -115/100-25/100-10/100= -150/100= -1,5;
3) 2,03-x=2,3
-х=2,3-2,03
-х=0,27
х=-0,27
4) 1 3/12-у=2 7/10
-у=2 7/10-1 3/12
-у=27/10-15/12
-у=162/60-75/60
-у=87/60
-у=1,45
у=-1,45