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nguyenquocviet15t12
2 năm trước
cho hai đường thẳng xx' và yy' cắt nhau tại O.Điểm M ta thuộc tia phân giác của x'Oy' và N nằm trong xOy. biết yOx'=120 độ và nOy'=150 độ. chứng tỏ N,O,M thẳng hàng
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