Mathematics problems in Hebei senior high school entrance examination

Solution: (1)y? =? 2t？ ; (2) When is BP? =? In 1, there are two situations:

① As shown in Figure 6, if point P moves from point M to point B, is there? MB？ ==? 4、MP？ =? MQ？ =? 3,

∴PQ？ =? 6. connect EM,

∵△EPQ is an equilateral triangle, ∴ EM ⊥ PQ. ∴ .

∵AB？ Point e is on AD.

∴△EPQ and trapezoidal ABCD overlap with △EPQ, whose surface

What is the product? . ?

(2) If point P moves from point B to point M, it is derived from the question.

PQ？ =? BM？ +? MQ？ BP？ =? 8、PC？ =? 7. Let PE and AD intersect at point F, QE and AD or AD.

The extension line passes through point G, and point P is PH⊥AD at point H, then

HP? =, huh? =? 1. In Rt△HPF, ∠HPF? =? 30 ,?

∴HF？ =? 3、PF？ =? 6.∴FG？ =? FE？ =? 2. FD again? =? 2,

As shown in Figure 7, Point G and Point D coincide. At this time △EPQ and trapezoidal ABCD.

The overlapping part of is trapezoidal FPCG with an area of? .

(3) can .4 ≤ t ≤ 5。