+ - +
----------------|----------------------|-----------------> x
-1 6
x ∈
![(-1;6)](https://tex.z-dn.net/?f=%28-1%3B6%29)
M² - 2m m
----------- = -----
3 2
m² - 2m m
----------- - ------ = 0
3 2
2m² - 4m - 3m
------------------- = 0
6
2m² - 7m
------------- = 0
6
2m² - 7m = m(2m-7) = 0
2m - 7 = 0
m = 0 m = 3.5
2) 3х² - 7х + 4 = 0
D = 49 - 48 = 1
х₁ = 7 - 1 ÷ 6 = 1 х₂ = 7 + 1 ÷ 6 = 2 целых 1/3
ответ: 1
3) лень))
Из второго уравнения 3x-2y=x/(-30)
поставляем в 1 ур-е
1/(-x/30) +x =7
-30/x+x=7
x²-7x-30=0
D=169
x₁=(7+13)/2=10
x₂=(7-13)/2=-3
1)x=10
3*10-2y=10/(-30)
2y=30+1/3
y=15 1/6
2)x=-3
3*(-3)-2y=1/10
2y=-9-1/10
2y=-9.1
y=-4.55=-4 11/20
ответ (10;15 1/6) (-3;-4 11/20)