Пошаговое объяснение: дай лучший ответ
1) х:1/3 = 3/4:1/2. 3/4:1/2 = 3/4*2/1=3/2*1/1=3/2
Х:1/3 = 3/2
Х = 1/3*3/2. 1/3*3/2 = 1/3*3/2 = 1/1*1/2 = 1/2
Х = 1/2
2) 1 1/2:а = 4 3/4:2 3/8.
4 3/4:2 3/8 = 19/4*8/19 = 1/1*2/1 = 2
1 1/2:а = 2
А = 1 1/2:2. 1 1/2:2 = 3/2*1/2 = 3/4
А = 3/4
3) 2,8:3,2 = 2,1:х 2,8:3,2 = 2 4/5:3 1/5 = 14/5*5/16 = 7/1*1/8 = 7/8
2,1:х = 7/8
Х = 2,1:7/8. 2,1:7/8 = 2 1/10:7/8 = 21/10*8/7 = 3/5*4\1 = 12/5 = 2 2/5
Х = 2 2/5
4) 2 1/2:3 1/8 = у:2 2/3. 2 1/2:3 1/8 = 5/2*8/25 = 1/1*4/5 = 4/5
У:2 2/3 = 4/5
У = 2 2/3*4/5. 2 2/3*4/5 = 8/3*4/5 =32/15 = 2 2/15
У = 2 2/15
5) сори хз
6) 1/6:х = 2:3 3/7. 2:3 3/7=2/1*7/24=1/1*7/12 =7/12
1/6:х = 7/12
Х = 1/6:7/12. 1/6:7/12 = 1/6*12/7 = 1/1*2/7 = 2/7
Х = 2/7
20/28 = 9x+2/28
20/28 - 2/28 = 9x
18/28 = 9x
x = 18/(28*9)
x = 2/28
x = 1/14