Это легко
3/6 ÷ 9/34 = 1·3/2·3 ÷ 9/34 = 1/2 ÷ 9/34 = 12 × 34/9 = 1·34/2·9 = 34/18 = 17·2/9·2 = 17/9 = 8 + 1·9/9 = 1 целая 8/9
98,6*1 целую 8/9
98 6/10 × 1 8/9 = 98 3·2/5·2 × 1 8/9 = 98 3/5 × 1 8/9 = 3 + 98·5/5 × 8 + 1·9/9 = 493 × 17/5*9 = 493·175·9 = 8381/45 = 11 + 186·45/45 = 186 11/45