uk cảm ơn –  Hàn Thiên Dii 07-03-16 04:55 PM
http://olm.vn/hoi-dap/question/31731.html –  ๖ۣۜTQT☾♋☽ 07-03-16 04:52 PM
a nguyên ta có : 6a + 1 = 2( 3a -1) + 3 chia hết cho 3a-1
=> 3 chia hết cho 3a-1
=> 3a-1 thuộc -3; -1; 1; 3
=> a = 0
bài này làm cũng giống nhau ghê bài dưới chỉ thêm mội vài kí tự thôi còn lại giống hết –  Hàn Thiên Dii 08-03-16 03:23 PM
với a nguyên ta có : 6a + 1 = 2( 3a -1) + 3 chia hết cho 3a-1
=> 3 chia hết cho 3a-1
=> 3a-1 thuộc -3; -1; 1; 3
=> a = 0

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