PDF《图形面积问题》

9 0 ?]u A P E=

9 0 ?, ^? u P A E=9

0 q$ ? P G? y 7$ S O A= O E , T u O A E= u O E A=

4 5 ?, T u P A G= u A P G=

4 5 ?, T P G= A G , T t =- t

2 +

2 t + 3-

3 , Y - t

2 + t =

0 , /D t = 1] t =

0 +??,$ q?u A P E=

9 0 P K ?x 7$A Q ?P K ,  P K=- t

2 +

2 t +

3 , A Q = t , K E= 3- t , P Q =- t

2 +

2 t + 3-

3 =- t

2 +

2 t , 第 4题解图③ S u A P Q+ u K P E= u A P Q+ u P A Q=

9 0 , T u P A Q= u K P E , pu P K E= u P Q A , T P K E ∽A Q P , T P K A Q = K E P Q , Y - t

2 +

2 t +

3 t = 3- t - t

2 +

2 t , Y t

2 -t - 1=

0 , /D t = 1+

5 2 ] t = 1-

5 2 ??t?.* P $t .?4 1] 1+

5 2 . !5 . #$??gh y = a x

2 + b x + c .#?8 x 79: A `Bc*$? } A (-

1 ,

0 ) `* C (

0 ,

5 )........