a) [545 - (45 + 4.25)] : 50 - 2000 : 250 + 215 : 213
First, let's simplify the expression inside the parentheses:
[545 - (45 + 4.25)] = [545 - 49.25] = 495.75

Now let's simplify the expression inside the brackets:
495.75 : 50 = 9.915

Now let's simplify the expression after the colon:
2000 : 250 = 8

Now let's simplify the expression after the plus sign:
215 : 213 = 1.009

Now let's put it all together:
9.915 - 8 + 1.009 = 2.924

Therefore, the value of expression a) is 2.924.

b) [504 - (25.8 + 70)] : 9 - 15 + 190
First, let's simplify the expression inside the parentheses:
[504 - (25.8 + 70)] = [504 - 95.8] = 408.2

Now let's simplify the expression inside the brackets:
408.2 : 9 = 45.356

Now let's simplify the expression after the minus sign:
45.356 - 15 = 30.356

Now let's simplify the expression after the plus sign:
30.356 + 190 = 220.356

Therefore, the value of expression b) is 220.356.

c) 5 . {26 - [3.(5 + 2.5) + 15] : 15}
First, let's simplify the expression inside the parentheses:
5 + 2.5 = 7.5

Now let's simplify the expression inside the brackets:
3 . 7.5 = 22.5

Now let's simplify the expression inside the curly braces:
22.5 + 15 = 37.5

Now let's simplify the expression after the colon:
37.5 : 15 = 2.5

Now let's multiply 5 by 2.5:
5 . 2.5 = 12.5

Therefore, the value of expression c) is 12.5.

d) [1104 - (25.8 + 40)] : 9 + 316 : 312
First, let's simplify the expression inside the parentheses:
[1104 - (25.8 + 40)] = [1104 - 65.8] = 1038.2

Now let's simplify the expression inside the brackets:
1038.2 : 9 = 115.356

Now let's simplify the expression after the plus sign:
316 : 312 = 1.013

Now let's put it all together:
115.356 + 1.013 = 116.369

Therefore, the value of expression d) is 116.369.