53-y+13=24
-y=24-13-53
-y=-42 / (-1)
y=42
1)x+7*4=40
x+28=40
x=40-28
x=12
2)<span>6*3+Х=72,
18+x=72
x=72-18
x=54
3)</span><span>80-х=9*5,
80-x=45
-x=45-80
-x=-35
4)</span><span>12+х=5*8,
12+x=40
x=40-12
x=28
5)</span><span>Х-32:4=50,
x-8=50
x=50+5
x=58
6)</span><span>Х+2*6=94
x+12=94
x=94-12
x=82
</span>
A1=lg(2^x-1)
a2=1/2lg31=lg√31
a3=lg(2^x+1_
d=a2-a1=a3-a2
lg√31-lg(2^x-1)=lg(2^x+1)-lg√31
lg[√31/(2^x-1)]=lg[(2^x+1)/√31]
√31/(2^x-1)=(2^x+1)/√31
2^2x-1=31
2^2x=32
2^2x=2^5
2x=5
x=2,5