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anhdominh43
2 năm trước
Bài 1) tìm x thuộc z biết: a) 5 - ( x - 3 )^2= -20 b) | x - 12|- ( -5 )=12 c) -3x - 15= 2x+ 20 Bài 2) a) tìm cặp số nguyên x,y thỏa mãn: x^2y - 2x= 5 b) tìm số nguyên n biết: ( 2n - 3 ) chia hết cho ( n+1 ) Bài 3) tìm n thuộc z: a) ( 6n+3 ) chia hết cho n b) ( 4n+4 ) chia hết cho ( 2n - 1 ) c) ( n^2 - 9n + 7 ) chia hết cho ( n - 9 )
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