(p )ও (q )দুইটি বাস্তব সংখ্যার ক্ষেত্রে- (i. ) ( begin vmatrix p+q end vmatrix le begin vmatrix p end vmatrix + begin vmatrix q end vmatrix ) (ii. ) ( begin vmatrix pq end vmatrix = begin vmatrix p end vmatrix + begin vmatrix q end vmatrix ) (iii. ) ( begin vmatrix p-q end vmatrix le begin vmatrix p end vmatrix + begin vmatrix q end vmatrix )