Question

tim tat ca cac so nguyen x biet rang x+4 chia het cho x+1

 

Answer 1

suy ra x+4 chia hết cho x+1

suy ra x+1+3 chia hết cho x+1

suy ra 3 chia hết cho x+1

suy ra x+1E{1.-1,3,-3}

suy ra xE { 0,-2,2,-4}