Question

Puteți să-mi Spune-ți răspunsul de la 11-15,fără 16.
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Answer 1

Explicație pas cu pas:

11)

prima : x

a doua : y

a treia : z

x + y + z = 63

x = 2y

z = 3 + (x + y)

z = 3 + (2y + y)

z = 3 + 3y

2y + y + 3 + 3y = 63

6y + 3 = 63

6y = 63 - 3

6y = 60

y = 10

x = 2 × 10

x = 20

z = 3 + 3 × 10

z = 3 + 30

z = 33

12)

$\frac{x}{y} = 1$

$\frac{y}{z} = 2$

y - z = 4 => y = 4 + z

$\frac{y}{z} = \frac{2}{1}$

$\frac{4 + z}{z} = \frac{2}{1}$

$4 + z = 2z$

4 = - z + 2z

4 = 2z - z

4 = z

y = 4 + z

y = 4 + 4

y = 8

$\frac{x}{y} = 1$

$\frac{x}{8} = \frac{1}{1}$

x = 8

13)

a + b + c = 100

a - x = 20 => a - 20 = x

b - x = 40

c - x = 10

b - (a - 20) = 40

b - a + 20 = 40

b - a = 40 - 20

b - a = 20 => b - 20 = a

c - (a - 20) = 10

c - (b - 20 - 20) = 10

c - (b - 40) = 10

c - b + 40 = 10

c - b = 10 - 40

c - b = - 30 => c + 30 = b

a = c + 30 - 20

a = c + 10

c + 10 + c + 30 + c = 100

3c + 40 = 100

3c = 100 - 40

3c = 60

c = 20

a = 20 + 10

a = 30

b = 20 + 30

b = 50

14)

x + y + z = 72

x - a = 9 => x - 9 = a

y - a = 6

z - a = 18

y - (x - 9) = 6

y - x + 9 = 6

y - x = 6 - 9

y - x = - 3 => y + 3 = x

z - (x - 9) = 18

z - x + 9 = 18

z - x = 18 - 9

z - x = 9

z - (y + 3) = 9

z - y - 3 = 9

z - y = 9 + 3

z - y = 12 => z - 12 = y

a = y + 3 - 9

a = y - 6

a = z - 12 - 6

a = z - 18

x = z - 12 + 3

x = z - 9

z - 9 + z - 12 + z = 72

3z - 21 = 72

3z = 72 + 21

3z = 93

z = 31

x = 31 - 9

x = 22

y = 31 - 12

y = 19

15)

bluza rosie : r

bluza verde : v

bluza galbena : g

r + v + g = 87

r = 2v

$g = \frac{r}{2} - 5$

$g = \frac{2v}{2} - 5$

$g = v - 5$

2v + v + v - 5 = 87

4v - 5 = 87

4v = 87 + 5

4v = 92

v = 23

r = 2 × 23

r = 46

g = 23 - 5

g = 18