Sin(2x)=sgrt/2;
2x=(-1)^k*pi/4 +pi*k;
x=(-1)^k*pi/8 +pi*k/2
ОДЗ
3x-2≥0
3x≥2
x≥2/3
3x-2<1
3x<3
x<1
2/3≤x<1
Корень = Корню
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X^2 - 2X + 1 = 10X - 3 - 4X^2
X^2 + 4X^2 - 2X - 10X + 1 + 3 = 0
5X^2 - 12X + 4 = 0
D = 144 - 4 * 5 * 4 = 144 - 80 = 64 ; V D = 8
X1 = ( 12 + 8 ) : 10 = 2
X2 = (12 - 8 ) : 10 = 0.4
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( X^2 - 2X + 1 ) > 0
4 - 4 + 1 > 0
0.16 - 0.8 + 1 > 0
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(10X - 3 - 4X^2) > 0
20 - 3 - 16 = 1 ( > 0)
4 - 3 - 0.64 ( > 0)
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ОТВЕТ: 2 и 0.4
X+y+z=30
y=x-2
z=x-4
x+x-2+x-4=30
3x=30+2+4
3x=36
x=12
y=12-2=10
z=12-4=8