1279
1) 0,9[ + 3/4х - 1,15х = 0,9х + 0,75х - 1,15х = 0,5х
0,5 * 3 = 1,5
2) 5 3/8у + 2,25у - 1 9/16у = 5 3/8у + 2 1/4у - 1 9/16у = 5 6/16у + 2 4/16у - 1 9/16у =
= 7 10/16у - 1 9/16у = 6 1/16у
6 1/16 * 4 = 97/16 * 4 = 97/4 = 24,25
3) 1 5/6х - 2/3х + 0,25х = 1 5/6х - 4/6х + 1/4х = 1 1/6х + 1/4х = 1 2/12х + 3/12х =
= 1 5/12х
1 5/12 * 6 = 17/12 * 6 = 17/2 = 8,5
4) 6,12у + 1 2/5у - 0,32у = 6,12у + 1,04у - 0,32у = 6,84у
6,84 * 5 = 34,2