100а⁴-1 (10a²-1)(10a²+1) (10a²-1) (10a²+1)
----------- = ------------------------ = ------------ * --------------
9b² (3a)² 3a 3a
<span>0,6*(28x+44(2,5-x))=16x+32(2,5-x)</span>
<span>0.6*(-16x+110)-16x-32*(2.5-x)=0</span>
<span>-25.6x+66-32*(2.5-x)=0</span>
<span>-25.6x+66-80+32x=0</span>
<span>-25.6x-14+32x=0</span>
<span>6.4x-14=0</span>
x=14/6.4
x=35/16 (~2.1875)
F`(x)=3x²-6x
g`(x)=1/√x
(3x²-6x)/√x=0,x>0
3x(x-2)/√x=0
3√x*(x-2)=0
√x=0
x=0 не удов усл
x=2
Д= 441-4•5•18=441-360=81
х=-21+9/10=-1,2
х=-21-9/10=-3
Ответ:-1,2 и -3