<span>1) log x (2) - log 4 (x) +6/7=0 </span>
<span> log x (2) -1/2log х (2) +6/7=0</span>
<span> log^2 x (2) -1/2 +6log х (2)/7=0</span>
<span> log х (2)=t</span>
<span> t^2 -1/2 +6/7*t =0</span>
<span> дальше обычное квадратное уравнение</span>
<span> </span>log х (2)=t1
<span> log х (2)=t2</span>
<span> </span>ответ x1 ; x2
<span><span>2) 3/(log 4 (х)) +2/ (log 4 (4)+ log 4 (х))+ 3/( log 4 (16)+ log 4 (х))=0</span></span>
<span><span> log 4 (х)=t</span></span>
<span><span> 3/t +2/(1+t)+3/(2+t)=0</span></span>
<span><span> t1= -3/2</span></span>
<span><span> t2= -1/2</span></span>
log 4 (х)=t1=-3/2 ; x1=1/8
<span><span> log 4 (х)=t2=-1/2 ; x2=1/2</span></span>
<span><span> ответ 1/8 ; 1/2</span></span>