题目内容
(Figure 3)In a trapezoid ABCD，AE=
DE，CE⊥AD，CE is a bisector to ∠BCD，then the ratio of the area of a quadrilateral ABCE to 
that of a triangle CDE is _____.
(英汉小词典trapezoid：梯形；bisector：平分线；ratio：比值；quadrilateral：四边形)
7:9
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