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huongdam1511
2 năm trước
chứng tỏ rằng khi m thay đổi các đường thẳng có phương trình sau luôn đi qua một điểm cố định a,(-5m+4)x+(3m-2)y =0 b,(2m^2+m+4)x-(m^2-m-1)y-5m^2-4m-13=0
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