№1
а)<span>6x-7>5
x>2
x(2;=беск.)
b)x+3>=3x-5
2x<=8
x<=4
x(-беск.;4]
c)5x-5+6>=6x
x<=1
x(-беск.;1]
№2
</span>-2<5x+3<13
<span>-5<5x<10
-1<x<2
x(-1;2)
</span>
3a) C⁴ * C⁷ :C⁹ = C⁴⁺⁷⁻⁹ = C²
б) (a⁴)³ * a = a¹² * a = a¹³
в) (- 2x)⁴ = 16x⁴
4a) 20³ * 0,5³= (20 * 0,5 )³ = 10³ = 1000
б) (4 * 2⁵) / 2⁷ = (2² * 2⁵) / 2⁷ = 2⁷ / 2⁷ = 1
5) [(y²)³]⁴ = (y⁶)⁴ = y²⁴
О.Д.З.:
(х-3)(х-4)
х не = 3
х не = 4.