Đáp án:
Giải thích các bước giải: √(4x ²) =2 ⇔ 4x ² = 4 ⇔ x ² =1
⇔ x = ± 1
√(4x ²) =2
⇔ 4x ² = 4
⇔ x ² =1
Choose the best answer.
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