X - 4 = x^2 - 3x
x^2 - 4x + 4 = 0
( x - 2 )^2 = 0
x = 2
-----------------------
y = x^2 - 3x
y = 1
-----------------------
1 = 2k - 4
2k = 5
k = 2,5
|4х|=8
4х=8
х=8:4
х=2.
-4х=8
х=8:(-4)
х=-2.
X²(-x²-4)≤4(-x²-4)
x²(-x²-4)-4(-x²-4)≤0
(x²-4)(-x²-4)≤0
-(x+2)(x-2)(x²+4)≤0
(x+2)(x-2)(x²+4)≥0
_+_-2__-___2_____+___x
Ответ: x∈ (-∞;-2] U [2;+∞)
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<span>sin(30 градусов+x)cosx-cos(30 градусов+x)sinx=0,5
sin(x+30-x)=sin30</span>°=0.5<span>
</span>