( m + 8 )X = m + 8
( m + 8 )X - ( m + 8 ) = 0
( m + 8 )( X - 1 ) = 0
m + 8 = 0
m = - 8
X - 1 = 0
X = 1
<span>2xy = xz - yz + 2xyz</span>
![y=-\frac23x^\frac32+3x+19\\y'=-x^\frac12+3=0\Leftrightarrow x=9\\ y(9)=-\frac23\cdot27+27+19=28\ \max\\](https://tex.z-dn.net/?f=y%3D-%5Cfrac23x%5E%5Cfrac32%2B3x%2B19%5C%5Cy%27%3D-x%5E%5Cfrac12%2B3%3D0%5CLeftrightarrow+x%3D9%5C%5C+y%289%29%3D-%5Cfrac23%5Ccdot27%2B27%2B19%3D28%5C+%5Cmax%5C%5C+)
В точке 9 значение максимально, т.к. производная меняет знак с плюса на минус
Решение
<span>1,2а⁵b³–2,4a³b⁵ = 1,2a</span>³b³ * (a² - 2b²)