Given the expression 8___2___1___3___4 = 5
We are to substitute the signs into the blank spaces that will make the statement true
The correct substitute is as shown

Solving using PEDMAS to confirm
P is parenthesis
E is exponent
D is division
M is multiplication
A is addition
S is subtraction
Solving based on the precedence;
= (8/2)*1-3+4
= (4*1)-3+4
= 4 - 3 + 4
= (4-3) + 4
= 1 + 4
= 5
Hence the order of operation is :, X, -, +
division, multiplication, subtraction and addition