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kendysybach
2 năm trước
blink ơi 3 thành phố A, B, C là 3 đỉnh của 1tam giác vuông tại C. Biết AC=30km, CB=40km. nếu đặt máy phát sóng truyền thanh có bán kính hoạt động bằng 40km ở thành phố A thì thành phố C có nhận được tính hiệu không? Vì sao? giúp mik vs
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