Question

решите пж я не могу​

Answer 1

Ответ:

$1)6x \div 8 = 12 \div 3 \\ 18x = 96 \\ x = 96 \div 18 \\ \times \frac{16}{3 } \\ 2)31 \div (7x) = 1 \div 4 \\ 124 = 7x \\ 7x = 124 \\ x = \frac{124}{7}$

Answer 2

1) 6х : 8 = 12 : 3
6х : 8 = 4
6х = 4•8
6х = 24
х = 24 : 6
х = 3

2) 31 : 7х = 1 : 4
7х • 1 = 31 • 4
7х = 124
х = 124 : 7
х = 17 5/7

3) 12 : у = 15 : 7,5
12 : у = 2
у = 12 : 2
у = 6

4)
17у : 85 = 4 : 5
17у = 85 • 4 : 5
17у = 17 • 4
у = 17 • 4 : 17
у = 4

5) 45 : 15 = 2,5а : 5
0,5а = 3
а = 3 • 0,5
а = 1,5

6) 1,3 : (3 1/4 • у) = 2 1/3 : 1/6
13/10 : (13у/4) = 7/3 : 1/6
4/10у = 14
у = 4/(10•14)
у = 1/(5•7)
у= 1/35

7) 0,2m : 26 = 1 1/3 : 13 1/3
0,1m : 13 = 4/3 : 40/3
0,1m : 13 = 0,1
m = 13 • 0,1 / 0,1
m b= 13

8) 1 3/7 • n : 4 1/7 = 7 1/3 : 3,3
10n/7 : 29/7 = 22/3 : 33/10
10n • 7 / (7 • 29) = 22 • 10 / (33 • 3)
10n/29 = 20/9
n = 20•29/(10•9)
n = 58/9
n = 6 4/9

9) 1,5 : (3 1/3 • k) = 3/14 : 4 2/7
15/10 : 10k/3 = 3/14 : 30/7
15•3/(10•10k) = 3•7/(14•30)
45/100k = 1/20
100k = 45 • 20
k = 900/100
k = 9

10) 1,5 : 3 7/19 = 4/5 • b : 2 3/8
15/10 : 64/19 = 4b/5 : 19/8
4•8b/(5•19) = 15•19/(10•64)
b = 15•19•5•19/(10•64•4•8)
b = 15•19•19/(2•64•4•8)
b = 1805/(64•64)
b = 1805/4096

11) 1 8/9 : 11 1/3 = 5/8 : (5 1/3 • b)
17/9 : 34/3 = 5/8 : 16b/3
17•3/(34•9) = 5•3/(8•16b)
1/3 = 15/(128b)
128b = 15•3
b = 45/128

12) 1 7/9 • x : 6 2/3 = 5 : 2
16x/3 : 20/3 = 5/2
16x•3/(3•20) = 5/2
4x/5 = 5/2
x = 5•5/(2•4)
x = 25/8
x = 3,125