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Fill in the blanks in the last question of Wenzhou mathematics senior high school entrance examination.
AD‖BC,AB=CD,AC⊥BD, you know ▲AOD ▲BOC is an isosceles right angle ▲

So ad/ao = 2；; BC/OC=^2

So (ad+BC)/(ao+oc) = 2.

So ao+oc = (ad+BC)/2 = 4 2/2 = 4.

So AC=4

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