<span>х²-4х+3=0
</span><span>(х-3)(х+1)=0
х-3=0 или х+1=0
х1=3 или х2=-1
Ответ: 3;-1
</span><span>х²-4х+4=0
</span>(х-2)<span>² = 0
х-2=0
х=2
Ответ: 2</span>
-1 <= (x^2 - 5x + 4) / (x^2 - 4) <= 1;
(x^2 - 5x + 4) / (x^2 - 4<span>) - 1 <= 0;
</span>(-5x + 8) / ((x - 2) * (x + 2)) <= 0;
x ∈ (-2; -1.6] U (2; +00);
-1 <= (x^2 - 5x + 4) / (x^2 - 4<span>);
</span>(x^2 - 5x + 4) / (x^2 - 4<span>) + 1 >= 0;
</span>(2x^2 - 5x) / ((x - 2) * (x + 2)<span>) >= 0;
</span>x(2x - 5) / ((x - 2) * (x + 2)<span>) >= 0;
</span><span>x ∈ (-00; -2) U [0; 2) U [2.5; +00);
</span>Ответ: <span>x ∈ [2.5; +00).</span>
Y=π/3-x
sinx*sin(π/3-x)=0,25
1/2(cos(2x-π/3)-cosπ/3)=0,25
cos(2x-π/3)-1/2=0,5
cos(2x-π/3)=1
2x-π/3=2πn
2x=π/3+2πn
x=π/6+ππn
A)5^-4*5=5^-3=1/125
Б)12^1 =12
В)3^3=27
^степень
Не всё знаю , но что знала я написала ...