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))