<span>(√12-5)(√12+5)=(</span>√12)²-5²=<span>12-25=-13
</span>
3 корня так как 3 части уравнения
5x -9x < -12 - 4
-4x < -16
X < 4
<span>ln x^2 = 0
</span>ln x^2 = <span>ln1
</span><span>x^2 =1
</span>x=+1;-1
<span>log3 3^x =4
</span>log3 3^x = <span>log3 81
</span><span>3^x-81
</span>x=4
<span>log5 (2x-x^2)=0
</span>log5 (2x-x^2)=<span>log5 1
</span>2x-<span>x^2=1
</span><span>x^2-2x+1=0
</span>x=1
ну вроде так