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	Các bình luận về: Đề: Cho hàm số $y=f(x)=\frac{ax+b}{cx+d}$,với $c \neq 0,D=ad-bc \neq 0.$ Chứng minh rằng đồ thị hàm số nhận điểm $I(-\frac{d}{c};\frac{a}{c})$ làm tâm đối xứng.	</title>
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