6^28-6^27-6^26=6^26(6^2-6-1)=6^26(36-6-1)=6^26*29.
(2-х)²-х(х+1,5)=4
Решение
4-4х+х²-х²-1,5х=4,
4-4х-1,5х-4=0,
-4х-1,5х=0,
-5,5х=0,
х=0.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
4.
x²-4>0
(x-2)(x+2)>0
x∈(-∞; -2)∨(2; +∞)
3. sin(α-3π/2)*cos(2π-α)*sin(π+α)=sin(-(3π/2-α))*cosα*(-sinα)=-(-cosα)*cosα*(-sinα)=-cos²α*sinα