-9р³ = -9 * (-1/3)³ = -9 * (- 1/27) = 9/27 = 1/3
A) 16a²-81b² = (4a - 9b)*(4a+9b)
<span>б) 36x²+84x+49 = (6x+7)</span>².
81/25a⁸+6a⁴b⁵+25/9b¹⁰=
(9/5a⁴+5/3b⁵)²
Проверка:9/5*5/3*2=45/15*2=3*2=6
2sin2x=1
Sin2x=1/2
Sinx=1/2÷2
Sinx=1/2×1/2
Sinx=1/4
Вроде так