Toán Lớp 12: vẽ bbt tìm khoảng đb,nb a)y = (-x)/(x ²+1) b) y = (-2x)/(x ²+36) -

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Toán Lớp 12: vẽ bbt tìm khoảng đb,nb a)y = (-x)/(x ²+1) b) y = (-2x)/(x ²+36)