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phuongthaotrinh68
2 năm trước
Vẽ đồ thị hàm số y= |x-4| + |x+4| a, Tìm m để phương trình |x-4| + |x+4| = m có đúng 2 nghiệm. b,Tìm m để phương trình |x-4| + |x+4| = m có trên 2 nghiệm.
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