Given the following set of assembly instructions:

LOAD, STORE, ADD, SUB, MUL, DIV, MOV

Write the assembly code for one, two, and three address machines to compute

$P=\frac{(Q+R)*S}{T-U}$

Next, compare the differences between one$-$address, two$-$address, and three$-$address machines

in terms of efficiency and complexity.