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dang24092000
2 năm trước
Cho hình vẽ bên dưới. Biết CAx + ACB > 180°, chứng minh rằng: a) Nếu Ax song song với By thì xAC} + ACB + Cby = 360°; b) Nếu xAC + ACB + Cby = 360° thì Ax song song với By.
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