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September 16, 201746平行线的五种模型15 minutesPlay[例46_1]∠A和∠B的两边互相平行,∠A比∠B的三倍少20°,则∠A=_______。...moreShareView all episodesBy 方先生侃数理化September 16, 201746平行线的五种模型15 minutesPlay[例46_1]∠A和∠B的两边互相平行,∠A比∠B的三倍少20°,则∠A=_______。...more