(0,5:1,25+1 2/5:1 4/7 -3/11) *11

1) 0,5 : 1,25 =0,42)1 2/5 : 1 4/7 = 7/5  :  11/7 = 7/5  *  7/11 =  49/55 3)0,4 + 49/55 = 4/10 + 49/55 =2/5  +  49/55 = (2 × 11  +  49 × 1)/55 = (22  +  49)/55 =  71/55 = 1 16/55 4)1 16/55 - 3/11 =71/55  -  3/11  =(71 × 1  -  3 × 5)/55 = (71  -  15)/55 =  56/55 = 1 1/55 5) 1 1/55 * 11 =56/55 *  11 =  56/5 = 11 1/5ответ 11 1/5