Question

[Hoàng Phương Oanh]

5, Tim gia tri nguyen cua n de cac phan so sau co gia tri la so nguyen 

    \(A=\frac{3n+4}{n-1}\)

  \(B=\frac{6n-3}{3n+1}\)

Answer 1

[Đào Đức Mạnh]

A=3n+4/n-1=3n-3+7/n-1=3(n-1)/n-1+7/n-1=3+7/n-1. Vì A nguyên, 3 nguyên nên 7/n-1 nguyên => n-1 E Ư(7)

n-1	1	-1	7	-7
n	2	0	8	-6

b/6n-3/3n+1=6n+2-5/3n+1=2(3n+1)/3n+1-5/3n+1=2-5/3n+1=>3n+1 E Ư(5)

3n+1	1	-1	5	-5
n	0	-2/3	4/3	-2

Answer 2

[Nguyễn Mai Ann]

Tim gia tri n thuoc N, biet : 2n² + 1/n² - 1 de A nhan gia tri nguyen