Question

Только 0.16. !!!2 не получается

Answer 1

Ответ:

1)1/2 * x - 1/3 * y = 1; 3x - 5y = - 3;

x = 2 + 2/3 * y; 3x - 5y = - 3;

3(2 + 2/3 * y) - 5y = - 3;

y=3;

x = 2 + 2/3 * 3;

х=4;

(x,y)=(4,3);

1/2 * 4 - 1/3 * 3 = 1; 3 * 4 - 5 * 3 = - 3;

1=1

-3-3

(x,y)=(4,3).

2)1/4 * x - y = - 5

y = 5 + 1/4 * x; 1/2 * x - 1/7 * y = 3

1/2 * x - 1/7 * (5 + 1/4 * x) = 3

х=8

y = 5 + 1/4 * 8

y=7

(x, y) = (8, 7)

1/2 * 8 - 1/7 * 7 = 3

-5=-5

3 =3

(x,y) = (8.7)

3)3x - 2y = 1/2; 4y - x = 2/3

3x-2y= 1 2 \\ x= - 2/3 +4y

3(- 2/3 + 4y) - 2y = 1/2

y = 1/4

x = - 2/3 + 4 * 1/4

3* 1 3 -2* 1 4 = 1 \ 2

4 * 1/4 - 1/3 = 2/3

(x, y) = (1/3, 1/4)

4)2x-3y=-1\\ y/x = 0 ,75

x = - 1/2 + 3/2 * y; y/x = 0.75

y/(- 1/2 + 3/2 * y) = 0, 75

y=3

x = - 1/2 + 3/2 * 3

х=4

(x, y) = (4, 3)

2 * 4 - 3 * 3 = - 1; 3/4 = 0.75

(x,y)= (4,3)

Answer 2

Ну якось так, точно незнаю чи правильно