16х^2 = 8х - 1
16х^2 - 8х + 1 = 0
D = 64 - 64 = 0 ( один корень )
X = 8 : 32 = 1/4 = 0,25
Ответ 0,25
1)а/(0,5а+1)+(2/3 а)/(2-а)+2а/(1/4 а^2-1)=2a/(a+2)-2a/3(a-2)+8a/(a-2)(a+2)=
=(6a²-12a-2a²-4a+24a)/3(a²-4)=(4a²+8a)/3(a²-4)=4a(a+2)/3(a-2)(a+2)=
=4a/3(a-2)
2)4a/3(a-2)*(0,5а-1)/(2,5а-2)=4a/3(a-2)*(a-2)/(5a-4)=4a/(15a-12)
{2x+7>4x-8⇒4x-2x<7+8⇒2x<15⇒x<7,5
{10+4x>0⇒4x>-10⇒x>-2,5
x∈(-2,5;7,5)
(5p + 3q - 2q)(5p + 3q + 2q) = (5p + q)(5p + 5q) = (5p + q) * 5 (p + q) = 5(5p + q)(p + q)