Dựa vào Atlat địa lí Việt Nam trang 6, 7 cho biết Vịnh Hạ Long, vịnh Xuân Đài lần lượt thuộc các tỉnh, TP nào?
A.Hải Phòng, Đà Nẵng.
B.Quảng Ninh, Phú Yên.
C.Quảng Ninh, Quảng Nam.
D.Phú Yên, Hải Phòng.

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Tìm hai số tự nhiên \(a\) và \(b\) biết \(BCNN(a;\,\,b) - UCLN\left( {a,\,\,b} \right) = 35.\)
A.\(\left( {a;\,\,b} \right) = \left\{ {\left( {1;\,36} \right),\,\,\left( {36;\,\,1} \right),\,\,\left( {4;\,\,9} \right),\,\,\left( {9;\,\,4} \right),\,\,\left( {5;\,\,40} \right),\,\,\left( {40;\,\,5} \right),\,\,\left( {7;\,\,42} \right),\,\,\left( {42;\,\,7} \right),\,\,\left( {35;\,\,70} \right),\,\,\left( {70;\,\,35} \right)} \right\}.\)
B.\(\left( {a;\,\,b} \right) = \left\{ {\left( {1;\,36} \right),\,\,\left( {36;\,\,1} \right),\,\,\left( {4;\,\,9} \right),\,\,\left( {9;\,\,4} \right),\,\,\left( {5;\,\,40} \right),\,\,\left( {40;\,\,5} \right),\,\,\left( {7;\,\,42} \right),\,\,\left( {42;\,\,7} \right),\,\,\left( {14;\,\,21} \right),\,\,\left( {21;\,\,14} \right)} \right\}.\)
C.\(\left( {a;\,\,b} \right) = \left\{ {\left( {1;\,36} \right),\,\,\left( {36;\,\,1} \right),\,\,\left( {5;\,\,40} \right),\,\,\left( {40;\,\,5} \right),\,\,\left( {7;\,\,42} \right),\,\,\left( {42;\,\,7} \right),\,\,\left( {14;\,\,21} \right),\,\,\left( {21;\,\,14} \right),\,\,\left( {35;\,\,70} \right),\,\,\left( {70;\,\,35} \right)} \right\}.\)
D.\(\left( {a;\,\,b} \right) = \left\{ {\left( {1;\,36} \right),\,\,\left( {36;\,\,1} \right),\,\,\left( {4;\,\,9} \right),\,\,\left( {9;\,\,4} \right),\,\,\left( {5;\,\,40} \right),\,\,\left( {40;\,\,5} \right),\,\,\left( {7;\,\,42} \right),\,\,\left( {42;\,\,7} \right),\,\,\left( {14;\,\,21} \right),\,\,\left( {21;\,\,14} \right),\,\,\left( {35;\,\,70} \right),\,\,\left( {70;\,\,35} \right)} \right\}.\)