Раскрываем скобки=0,25⁻³m⁶n⁻⁶
1. x³- 1=(х-1)(х²+х+1)
2. 27 + a³=(3+а)(9-3а+а²)
3. 216 - y³=(6-у)(36+6у+у²)
4. 1/8a³ + b³=(1/2а+b)(1/4a²-1/2a+b²)
5. a⁶ - 8=(a²-2)(a⁴+2a²+4)
6. a³b³ - c³=(ab-c)(a²b²+abc+c²)
7. a³ - b¹⁵c¹⁸=(a-b⁵c⁶)(a²+ab⁵c⁶+b¹⁰c¹²
8. 125c³d³ +0,008b³=(5cd+0,2b)(25c²d²-bcd+0,04b²)
5√(x+3)/(5x-1)+√(5x-1)/(x+3)=6
ОДЗ х+3/5х-1>0
=======-3=======1/5======
++++++ ------------ ++++++
√(x+3)/(5x-1)=t
5t+1/t=6
5y²-6t+1=0
D=36-20=16
y12=(6+-4)/10 = 1 1/5
√(x+3)/(5x-1)=1
(x+3)/(5x-1)=t
x+3=5x-1
4x=4
x=1
√(x+3)/(5x-1)=1/5
(x+3)/(5x-1)=1/25
25x+75=5x-1
20x=-76
x=-76/20=-3.8