3/7*5/8 4/33*11/19 (-15/17) * 1/4 (-3/22) * (-22/3) 4/9*3/52/11*44/571/8 * (-13/15) (-4/31) * (-31/4)

1). 3/7 * 5/8 = (3 * 5) / (7 * 8) = 15/56;

2). 4/33 * 11/19 = (4 * 11) / (33 * 19) = 4/57;

3). ( - 15/17) * 1/4 = ( - 15 * 1) / (17 * 4) = - 15/68;

4). ( - 3/22) * ( - 22/3) = [ - 3 * ( - 22) ] / (22 * 3) = 1;

5). 4/9 * 3/52 = (4 * 3) / (9 * 52) = 1/39;

6). 3/11 * 44/57 = (3 * 44) / (11 * 57) = 4/19;

7). 1/8 * ( - 13/15) = [1 * ( - 31) ] / (8 * 15) = - 31/120;

8). ( - 4/31) * ( - 31/4) = [ - 4 * ( - 31) ] * (31 * 4) = 1.