1) 25/27 х = 5/18; х=5/18 : 25/27; х=5/18 * 27/25; х=1/2 * 3/5; х=3/10 2) 13/17 х = 39; х=39 : 13/17; х=39 * 17/13; х=51 3) 4х = 5/7; х=5/7 : 4; х=5/7 * 1/4; х=5/28 4) х : 2 2/15 = 1 9/16; х=25/16 * 32/15; х=5/1 * 2/3; х=10/3=3 1/3 5) 4 4/9 : х = 5/27; х=40/9 : 5/27; х=40/9 * 27/5; х=8/1 * 3/1; х=24 6) 1 4/9 х = 5,2; х=26/5 : 13/9; х=26/5 * 9/13; х=2/5 * 9/1; х=18/5=3 3/5.