To simplify the expression \( \frac{x^{675}}{x^{453}} \), you can use the property of exponents which states that when you divide two powers with the same base, you subtract the exponents:
\[ \frac{x^a}{x^b} = x^{a-b} \]
In this case, \( a = 675 \) and \( b = 453 \):
\[ x^{675 - 453} = x^{222} \]
Thus, the simplified expression is:
\[ \frac{x^{675}}{x^{453}} = x^{222} \]