π/2
2 | 1
|
π_____|_____ 0
|
3 | 4
3π/2
π<α<2π -это 3 и 4 четверти
5x<125
x<125:5
x<25
x∈(-∞;25)
3x>1
x>1/3
x∈(1/3;∞)
<span>(x-2)^3 -27=(x-2)^3-3^3=(x-2-3)((x-2)^2+3(x-2)+3^2)=(x-5)(x</span>²-4x+4+3x-6+9<span>)=(x-5)(x</span>²-7x+7<span>)</span>
<span>(3x+2)(3x-4)=(2x+3)(3x-1)+(3x+1)(x-4)
9х</span>²-12х+6х-8=6х²-6х+9х-3+3х²-12х+х-4
9х²-6х²-3х²-12х+6х-6х-9х+12х-х=8-3-4
-10х=1
х= -0.1