①｛ x/2=y/3； 30% ·x -16% ·y=2%
问题描述：
①｛ x/2=y/3； 30% ·x -16% ·y=2%
② 2x+3y/4+2x-3y/3 =7 ; 2x+3y/3+2x-3y/2=8
答
(1)x/2＝y/3 ①30％x－16％y＝2％ ②由①,得3x－2y＝0 ③由②,得15x－8y＝1 ④④－③×5,得2y＝1解之,得y＝1/2把y＝1代入①,得x/2＝1/6解之,得x＝1/3∴x＝1/3,y＝1/2(2)2x＋3y/4＋2x－3y/3＝7 ①2x＋3y/3＋2x－3y/2...