12 * (1 3/4х + 5/8) = 8 1/2
1 3/4x + 5/8 =8 1/2 : 12
1 3/4x + 5/8 = 17/2 * 1/12
1 3/4x + 5/8 = 17/24
1 3/4x = 17/24 - 5/8
1 3/4x = 17/24 - 15/24
1 3/4x = 1/12
x = 1/12 : 1 3/4
x = 1/12 * 4/7
x = 1/21
12 * (1 3/4х + 5/8) = 8 1/2
12 *(7/4x + 5/8) = 17/2
21x+ 15/2 =17/2
21x = 17/2 - 15/2
21x = 1
x=1:21
наверное
ответ: х= 3/13.
Пошаговое объяснение:
12 * (1 3/4х + 5/8)=8 1/2.
1 3/4х +5/8 = 8 1/2 : 12.
13/4 х+ 5/8 =17/2*1/12.
13/4х + 5/8 = 17/24.
13/4х=17/24 -5/8.
13/4х = (17-15)/24.
13/4х= 2/24=1/12
х= 1/12 : 13/4.
х = 1/12 * 4/13 =1*4/12*13.
х = 3/13.
