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lengocdiep
2 năm trước
Bài 1 - Tính số đo các góc A2, A4 - Lấy M (M≠A)thuộc đường thẳng a. Qua M kẻ đường thẳng c vuông góc với đường thẳng a. (Vẽ hình ra giấy r chụp) - Chứng minh c vuông góc b Bài 2 So sánh: 2⁹⁰ và 5³⁶
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