6x-18x-2x-8=8
6x-18x-2x=8+8
-14x=16
x=16:(-14)
x=1.1428
-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>
<span>9a\a+3-3a=9+3-3а=12-3а</span>
2)a)(7m-n)(7m+n)/-3mn(7m-n)=-(7m+n)3mn
b)(9x-4)(9x+4)/(9x+4)^2=(9x-4)/(9x+4)
3)(x-4)^2-25=(x-4)^2-5^2=(x-4-5)(x-4+5)=(x-9)(x+1)=0
1)x-9=0 2) x+1=0
x=9 x=-1
Ответ 0.2 т.к. (3×0+2)/10=0+2/10=0.2