Toán Lớp 8: Chứng minh rằng mọi n thuộc z:
a) n (2n – 3) – 2n (n + 2) luôn chia hết cho 7
b) (n – 1) (n + 1) – (n – 7) (n – 5) chia hết cho 12
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Toán Lớp 8: Chứng minh rằng mọi n thuộc z:
a) n (2n – 3) – 2n (n + 2) luôn chia hết cho 7
b) (n – 1) (n + 1) – (n – 7) (n – 5) chia hết cho 12
Comments ( 1 )
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