Simplify the given expression:
$\frac{x^{45}}{y^{4}} \div - \frac{2 x^{9}}{y^{39}}$

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Final Answer: The simplified expression is $- \frac{x^{36} y^{35}}{2}$

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Step 1 ：Rewrite the given expression: $\frac{x^{45}}{y^{4}} \div - \frac{2 x^{9}}{y^{39}}$ as multiplication by flipping the second fraction: $\frac{x^{45}}{y^{4}} \times - \frac{y^{39}}{2 x^{9}}$

Step 2 ：Simplify the expression by using the properties of exponents: $- \frac{x^{36} y^{35}}{2}$

Step 3 ：Final Answer: The simplified expression is $- \frac{x^{36} y^{35}}{2}$

Simplify the given expression: x45y4÷−2x9y39

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Simplify the given expression:
$\frac{x^{45}}{y^{4}} \div - \frac{2 x^{9}}{y^{39}}$