4*1/5+4*3/7-4*1/35= 3/2*5/6+3/2: 9/10-3/2*13/18= 3/8*5+5/56-1/7: 1/5= 4/5: 5/8-4/5*24/25+1/25: 5/4= нужно

4*1/5+4*3/7-4*1/35= 28/5+ 12/7 - 4/35 = (28 + 60 - 4) /35 = 84/35 = 2 2/5

3/2*5/6+3/2:9/10-3/2*13/18= 3/2 * 5/6 + 3/2 * 10/9 - 3/2 * 13/18 = 15/12 + 30/18 - 39/36 = (45 + 60 - 39) / 36 = 11/6 = 1 5/6

3/8*5+5/56-1/7:1/5= 3/8 * 5/1 + 5/56 - 1/7 * 5/1 = ( 105 + 5 - ) / 56 = 70/56 = 10/8 =1 1/4

4/5:5/8-4/5*24/25+1/25:5/4= 4/5 * - 4/5 * 24/25 + 1/25 *4/5 = (160 - 96 +4) / 125 = 12/25