1) 1 - 5x² = 1 - 5 * (- 4)² = 1 - 5 * 16 = - 79
2) y⁷ * y¹² = y⁷⁺¹² = y¹⁹
y²⁰ : y⁵ = y²⁰⁻⁵ = y¹⁵
(y²)⁸ = y¹⁶
( 2y)⁴ = 16y⁴
a) - 2ab³ * 3a² * b⁴ = - 6a¹⁺²b³⁺⁴ = - 6a³b⁷
б) (-2a⁵b²)³ = - 8a¹⁵b⁶
5)
1) 10*6^2=10*36=360
2) (10a)^2=100a^2
Cos²x-sin²x+sin²x=0.75
cos²x=3/4
cosx=√3/2
cosx= - √3/2
x=+-π/6+πk
1) а^7 = а^7 * <span>а^0
2) </span>а^7 = а^6 * <span>а^1
3) </span>а^7 = а^5 * <span>а^2
4) </span>а^7 = а^4 * <span>а^3</span><span>
</span>