Solution: substitute x=4 into the analytical formula of AC.

Y=9/2 ∴PH=9/2.

∫△PHQ area is△ △AOC area?

The area of ∴△PHQ is 15/2.

The q point is on the straight line AC, and its coordinate is (t, -3/4t+ 15/2).

From the title, we can know that

1/2PH？ |t-4|= 15/2

T=66/9 and 6/9 are obtained.

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