4,6*2=9,2(сумма чисел)
9,2-5,4=3,8( второе число)
проверка: (3,8+5,4):2=4,6
1) 9 1/2 / 1,9 = 9,5 / 1,9 = 5
2) 5 - 4 1/5 = 4 5/5 - 4 1/5 = 4/5
3) 2,32 * 15/29 = 2 8/25 * 15/29 = 6/5 = 1 1/5
4) 1 1/5 + 4/5 = 1 5/5 = 2
5) 6 + 7 1/2 = 13 1/2
6) 13 1/2 / 15 = 27/2 / 15/1 = 27/2 * 1/15 = 3/10
7) 1 7/15 + 1/3 = 1 7/15 + 5/15 = 1 12/15 = 1 4/5
8) 1 4/5 * 5 = 9/5 * 5 = 9/1 = 9
9) <span>4/5 / 2 = 4/5 / 2/1 = 4/5 * 1/2 = 2/5
</span>10) 3/10 / 9 = 3/10 / 9/1 = 3/10 * 1/9 = 1/30
11) 2/5 + 1/30 = 12/30 + 1/30 = 13/30
Ответ : 13/30
1) 3х + 5 = 7х + 13
3х - 7х = 13 - 5
-4х = 8
х = -2
2) 6х - 13 = 17 - 9х
6х + 9х = 17 + 13
15х = 30
х = 2
3) 1,7 + 2,8 = 1,9х - 1,2
-1,9х = -1,2 - 1,7 - 2,8
-1,9х = -5,6
х = 2,95
4) 5/9х + 17/9 = 2/9х + 7/9
5/9х - 2/9х = 7/9 - 17/9
3/9х = -10/9
х = -10/3
х = -3.1/3
5) 2 (х + 2) - 4 (х - 3) = 5х + 9
2х + 4 - 4х + 12 = 5х + 9
2х - 4х - 5х = 9 - 4 - 12
-7х = -7
х = 1
Удобнее будет представить решение в виде рисунка: