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ngocthang1620
2 năm trước
viết mệnh đề P kéo theo Q và xét tính đúng sai viết mệnh đề đảo của nó và xét tính đúng sai a, P "tam giác ABC có B=90"; Q"AC^2=AB^2+BC^2 b, P"tam giác ABC có góc A= góc C"; Q"tam giác ABC cân" c, P" tứ giác ABCD là hình thoi"; Q"tứ giác ABCD có 2 đường chéo vuông góc"
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