1. <span>3m(-5my)=-15m²y
2. 2700x^3y^4
3.</span><span> (5xy)² · 2x=50x³y²
4. 2/3x^3y^4 z
5. </span><span>1,2m³n³p³
6. сорри не знаю.</span>
1) Сtgx = 1
x = arcCtg1 + π k , k∈Z
x = π/4 + πk , k ∈Z
Ответ: π/4
2)Cosx/2 = √2/2
x/2 = +-arcCos(√2/2) + 2πk , k ∈Z
x/2 = +-π/4 + 2πk , k∈Z
x = +-π/2 +4πk , k ∈Z
Ответ: π/2
3)2Sinx = √3
Sinx = √3/2
x = (-1)^narcSin√3/2 + nπ, n ∈Z
x = (-1)^n π/3 + nπ, n ∈ Z
Ответ: 2π/3
Хкв-5х+3х-15 <хкв.+9х+7
-2х-15 < 9х+7
-11х <7+15
-11х <22
х < -2
2cos60°-tg45° = 2*1/2 - 1 = 1-1=0