等于21
望采纳,谢谢!��̣�O(��_��)Oлл69 �� ( 23/10 + 69/70 )= 69 �� ( 161/70 + 69/70 ) ��ͨ�֣�= 69 �� ( 230/70 )��ͨ�֣�= 69 �� ( 23/7 )������= 69 �� ( 7/23 )���˳�ת����= 3 �� 7 ��Լ�֣�= 21