7.
如图,E,F是?ABCD的边AB上的两动点,且EF=AE+BF,过E,F作EH∥FG∥AD交CD于点H,G,连接AC得图中所示的①,②,③三块阴影,若其中①,③的面积分别为5,2,则②的面积为7.
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