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ta thấy góc NPO = góc NOy = 50 độ ( so le )
xét tam giác vuông NMP có
góc NPO + góc MPN = 90 độ ( tính chất tam giác vuông )
=> góc MPN = 90 độ - góc NOP =90 độ - 50 độ =40 độ
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ĐÃ VẼ LẠI 2 LẦN.LẦN NÀY LÀ LẦN 3
=> CUỘC ĐỜI ĐEN NHỌ CỦA COOL KID :V