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phuongthao02112k1
2 năm trước
cho xOy và x'O'y' có :Ox//O'x'; Oy//O'y' a, biết xOy<90độ ; x'O'y'<90độ CMR : xOy = x'O'y' b, xOy<90 độ , x'O'y'> 90độ CMR :xOy + x'O'y' =180 độ
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