1. A
2. D
3. B
(8x^2-4xy)/(y-2x)=(4x(2x-y))/(y-2x)=-(4x(y-2x))/(y-2x)=-4x
Log23 (2x-1) - log23 x = 0
{2x-1>0⇒x>0,5
{x>0
x∈(0,5;∞)
log(23)(2x-1)=log(23)x
2x-1=x
2x-x=1
x=1
2 log 5 x + 5 log 5 x + 2 = 0
x>0
7log(5)x=-2
log(5)x=-2/7
<span>log2 (3x - 6) = log2 (2x-3)
{3x-6>0⇒x>2
{2x-3>0⇒x>1,5
x∈(2;∞)
3x-6=2x-3
3x-2x=6-3
x=3
</span>
2×(0,5х+7)=8×(0,125х-3)
х+14=х-24
14=-24
утверждение ложно