1 5/7-4 3/13:1 19/26 = -46/63
1) 4 3/13 : 1 19/26 = 55/13 : 45/26 = 55/13 * 26/45 = 22/9 = 2 4/9
2) 1 5/7 - 2 4/9 = 1 45/63 - 2 28/63 = -46/63
1 х=-5,7
2 х= 6 2/3+13 5/6 = <span>6 4/6+13 5/6 = 19 9/6= 20 1/2 или 20,5
3 х= 8
х= 4</span>
1 девятая +7 девятых 9 восьмых
9 восьмых - 3 девятых 5 девятых равно d