Question

n+3 chia hết cho n-1

Answer 1

<=>(n-1)+4 chia hết n-1

=>4 chia hết n-1

=>n-1\(\in\){-1,-2,-4,1,2,4}

=>n\(\in\){0,-1,-3,2,3,5}

toán j dễ dữ

Answer 2

n +3 chia hết cho n-1 <=> (n-1) +4 chia hết cho n-1 <=> 4 chia hết n- 1

<=> n-1=1; n-1= -1; n-1 = 2; n-1 = -2; n-1=4; n-1= -4

<=> n=2; n=0; n=5; n= -3