Toán Lớp 8: Tìm n thuộc Z
c) 6n2 + n – 1 chia hết cho 3n + 2
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Toán Lớp 8: Tìm n thuộc Z
c) 6n2 + n – 1 chia hết cho 3n + 2
Comments ( 2 )
A = 6n^{2} + n – 1 = 6n^{2} + 4n – 3n – 2 + 1 = 2n(3n+2) – (3n+2) + 1