$$x=\frac{1}{2}$$Quantity A:$$5x^3-9x^2$$Quantity B:4

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$$x=\frac{1}{2}$$

Quantity A:$$5x^3-9x^2$$

Quantity B:4

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：C

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