Question

1.6-14x/2x+4=3-7x/2+x

2. {x²- y² - xy = 19
{x-y-3=0

3. {(x − 3)² + y² ≤ 4
{x >_2

4. x² + y-2≤0

Answer 1

1. Х1= 5-√809/28 , х2= 5+√809/28
2. (x, y) R²
Остальное я хз

Answer 2

Ответ:

2.ײ-y²-xy-19=0

f(×,y)=ײ-y²-×y-18

f×=2×-y

fy=2y-x

dy

___=2×-y

dx 2y-x

dy=y-2×

dx -(2y+×)

ответ dy= y-2×

. dx 2y+x