发布时间:2019-07-29 17:54:24
2、x + y = 100;①
( 6x + 20 * 4 )/4 = 3y/3,1.5x - y = -20; 加①
2.5x = 80,x = 32,y = 68;
3y/3 = y = 68 套 。