1) 2,8 * х = 9 1/3;х = 9 1/3 : 2,8;х = 9 1/3 : 2 8/10;х = 9 1/3 : 2 4/5;х = 28/3 : 14/5;х = 28/3 * 5/14;х = 2/3 * 5/1;х = 10/3;х = 3 1/3.Ответ: х = 3 1/3.2) х = 6/17 * 7,5;х = 6/17 * 7 5/10;х = 6/17 * 75/10;х = 3/17 * 75/5;х = 3/17 * 15/1;х = 45/17;х = 2 11/17.Ответ: х = 2 11/17.3) 4 1/9 : х = 7,4;х = 4 1/9 : 7,4;х = 37/9 : 7 4/10;х = 37/9 : 7 2/5;х = 37/9 : 37/5;х = 37/9 * 5/37;х = 1/9 * 5/1;х = 5/9.Ответ: х = 5/9.4) 9 2/11 * х = 10,1;х = 10,1 : 9 2/11;х = 10 1/10 : 9 2/11;х = 101/10 : 101/11;х = 101/10 * 11/101;х = 1/10 * 11/1;х = 11/10;х = 1 1/10;х = 1,1.Ответ: х = 1,1.