First, we simplify the first expression:

(2 2/5:1,2)×7/8 + 1 1/8:2
Convert 2 2/5 to an improper fraction: 12/5
Convert 1 1/8 to an improper fraction: 9/8

(12/5:1,2)×7/8 + 9/8:2
(12/5 (1+2))/8 + 9/(8 2)
(12/5 3)/8 + 9/16
36/40 + 9/16
(364)/(40*4) + 9/16
144/160 + 9/16
(144+90)/160
234/160 = 1 74/160 = 1 37/80

Now, simplify the second expression:

(4,5-1/3):2/9-(3,5+1/3)-4 1/2
4.5 - 1/3:2/9 - 3.5 - 1/3 - 4.5
4.5 - 1/3:2/9 - 3.5 - 1/3 - 4.5
4.5 - (1/3 (2+9)) - 3.5 -1/3 - 4.5
4.5 - (1/3 11) - 3.5 - 1/3 - 4.5
4.5 - 11/3 - 3.5 - 1/3 - 4.5
4.5 - 33/9 - 3.5 - 1/3 - 4.5
4.5 - 3.666 - 3.5 - 0.333 - 4.5
0.834 - 3.5 - 0.333 - 4.5
0.834 - 3.5 = -2.666

Therefore, the simplified expression is:

1 37/80 - 2 2/3 = -0.8475