Bài 1: Điền vào chỗ trống cho đúng (ghi lại vào vỡ nội dung cần điền) a, Phương trình 2x – 1 = 0 có tập nghiệm là. b, Phương trình 2x - 1=0 có nghiệm duy nhất là c, Phương trình x + 2 =x+ 2 có tập nghiệm là. d, Phương trình x + 5=x-7 có tập nghiệm là.

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