5/12 x+7/9=-1/9 x+1/4
5/12 x+1/9 x=1/4-7/9
(15+4)/36 x=(9-28)36
19/36 x= -19/36
x=-1
y=-5/12+7/9=(-15+28)/36=13/36
<span>(-1;13/36)</span>
3x²-5x-2<0
D=25+24=49
x1=(5-7)/6=-1/3
x2=(5+7)/6=2
x∈(-1/3;2)
Logx=t
1/5-t+2/1+t
1+t+10-2t=(5-t)(1+t)
11-t=5+4t-t^2
t^2-5t+6=0
D=5^2-4*1*6=1^2
t=3
t=2
Lgx=3
X=1000
Lgx=2
X=100
x~~0.073414 (3.89182-7. W_n(-0.346221)), n element Z
x = 1