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bangnhiphu
2 năm trước
Cho góc nhọn xOy , N phân giác với góc xOy , NP vuông góc với Ox , NP vuông góc với Oy a) Chứng minh : NP = NQ b) Tam giác OPQ là tam giác gì ? Vì sao ? c)QN cắt Ox tại D ,PN cắt Oy tại E CM : ND=NE
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